出版商 SPRINGER

Cover for H Clijsters · Biochemical and Physiological Aspects of Ethylene Production in Lower and Higher Plants: Proceedings of a Conference held at the Limburgs Universitair Centrum, Diepenbeek, Belgium, 22-27 August 1988 - Advances in Agricultural Biotechnology (Hardcover Book) [1989 edition] (1989)

Biochemical and Physiological As... (1989)

Cover for Geostatistics: Proceedings of the Third International Geostatistics Congress September 5-9, 1988, Avignon, France - Quantitative Geology and Geostatistics (Hardcover Book) [1989 edition] (1989)

Geostatistics: Proceedings of th... (1989)

Cover for H J Morel-seytoux · Unsaturated Flow in Hydrologic Modeling: Theory and Practice - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Unsaturated Flow in Hydrologic M... (1989)

H J Morel-seytoux

Cover for G Ferguson · Structure Reports for 1987, Volume 54A: Metals and Inorganic Sections - Structure Reports A (Hardcover Book) [1989 edition] (1989)

Structure Reports for 1987, Volu... (1989)

Cover for E T Jaynes · E. T. Jaynes: Papers on Probability, Statistics and Statistical Physics - Synthese Library (Paperback Book) [Softcover reprint of the original 1st ed. 1989 edition] (1989)

Softcover reprint of the original 1st ed. 1989 edition

E. T. Jaynes: Papers on Probabil... (1989)

Cover for V G Bagrov · Exact Solutions of Relativistic Wave Equations - Mathematics and its Applications (Hardcover Book) [1990 edition] (1990)

Exact Solutions of Relativistic ... (1990)

Cover for A. Ya Helemskii · The Homology of Banach and Topological Algebras - Mathematics and its Applications (Hardcover Book) [1989 edition] (1989)

The Homology of Banach and Topol... (1989)

A. Ya Helemskii

Cover for Wang Hao · Computation, Logic, Philosophy: A Collection of Essays - Mathematics and its Applications (Hardcover Book) [1990 edition] (1991)

Computation, Logic, Philosophy: ... (1991)

Cover for John W Bender · The Current State of the Coherence Theory: Critical Essays on the Epistemic Theories of Keith Lehrer and Laurence BonJour, with Replies - Philosophical Studies Series (Hardcover Book) [1989 edition] (1989)

The Current State of the Coheren... (1989)

Cover for A.T. Fomenko · Variational Principles of Topology: Multidimensional Minimal Surface Theory - Mathematics and its Applications (Hardcover Book) [1990 edition] (1990)

Variational Principles of Topolo... (1990)

Cover for E.M. Chirka · Complex Analytic Sets - Mathematics and its Applications (Hardcover Book) [1989 edition] (1989)

Complex Analytic Sets - Mathemat... (1989)

Cover for Christopher Benz · Oncogenes - Cancer Treatment and Research (Hardcover Book) [1989 edition] (1989)

Oncogenes - Cancer Treatment and... (1989)

Christopher Benz

Cover for G Ferguson · Structure Reports for 1982, Volume 49A: Metals and Inorganic Compounds - Structure Reports A (Hardcover Book) [1989 edition] (1989)

Structure Reports for 1982, Volu... (1989)

Cover for E.G. Ballard · Philosophy and the Liberal Arts - Contributions to Phenomenology (Hardcover Book) [1989 edition] (1989)

Philosophy and the Liberal Arts ... (1989)

Cover for Workshop on Road-vehicle-systems and Related Mathematics · Proceedings of the Second Workshop on Road-Vehicle-Systems and Related Mathematics - European Consortium for Mathematics in Industry (Hardcover Book) [1989 edition] (1989)

Proceedings of the Second Worksh... (1989)

Workshop on Road-vehicle-systems...

Cover for Nato Advanced Research Workshop on Scientific Foundations for Rights Based Fishing · Rights Based Fishing - Nato Science Series E: (Hardcover Book) [1989 edition] (1989)

Rights Based Fishing - Nato Scie... (1989)

Nato Advanced Research Workshop ...

Cover for Robert E Butts · Constructivism and Science: Essays in Recent German Philosophy - The Western Ontario Series in Philosophy of Science (Hardcover Book) [1989 edition] (1989)

Constructivism and Science: Essa... (1989)

Cover for D.W Smith · The Circle of Acquaintance: Perception, Consciousness, and Empathy - Synthese Library (Hardcover Book) [1989 edition] (1989)

The Circle of Acquaintance: Perc... (1989)

Cover for F. Selleri · Quantum Paradoxes and Physical Reality - Fundamental Theories of Physics (Hardcover Book) [1990 edition] (1989)

Quantum Paradoxes and Physical R... (1989)

Cover for A. Nicolas · Structures of Ophiolites and Dynamics of Oceanic Lithosphere - Petrology and Structural Geology (Hardcover Book) [1989 edition] (1989)

Structures of Ophiolites and Dyn... (1989)

Cover for Susan Steele · Agreement and Anti-Agreement: A Syntax of Luiseno - Studies in Natural Language and Linguistic Theory (Hardcover Book) [1990 edition] (1990)

Agreement and Anti-Agreement: A ... (1990)

Cover for Fred D\'agostino · Freedom and Rationality: Essays in Honor of John Watkins From his Colleagues and Friends - Boston Studies in the Philosophy and History of Science (Hardcover Book) [1989 edition] (1989)

Freedom and Rationality: Essays ... (1989)

Fred D\'agostino

Cover for Zdzistaw Augustynek · Time: Past, Present, Future - Nijhoff International Philosophy Series (Hardcover Book) [1991 edition] (1991)

Time: Past, Present, Future - Ni... (1991)

Zdzistaw Augustynek

Cover for Marc De Schrijver · Scintigraphy of Inflammation with Nanometer-sized Colloidal Tracers - Developments in Nuclear Medicine (Hardcover Book) [1989 edition] (1990)

Scintigraphy of Inflammation wit... (1990)

Marc De Schrijver

Cover for John P. Gerber · Anton Pannekoek and the Socialism of Workers' Self Emancipation, 1873-1960 - Studies in Social History (Hardcover Book) [1990 edition] (1990)

Anton Pannekoek and the Socialis... (1990)

Cover for Graham Kelsey · Anarchosyndicalism, Libertarian Communism and the State: The CNT in Zaragoza and Aragon, 1930-1937 - Studies in Social History (Hardcover Book) [1992 edition] (1991)

Anarchosyndicalism, Libertarian ... (1991)

Cover for Wayne Thorpe · `The Workers Themselves'. Syndicalism and International Labour: the Origins of the International Working Men's Association, 1913-1923 - Studies in Social History (Hardcover Book) [1990 edition] (1990)

`The Workers Themselves'. Syndic... (1990)

Cover for M F Cantley · Biotechnology in Europe and Latin America: Prospects for Co-operation (Hardcover Book) [1989 edition] (1989)

Biotechnology in Europe and Lati... (1989)

Cover for Paolo Fabbri · Recreational Uses of Coastal Areas: A Research Project of the Commission on the Coastal Environment, International Geographical Union - GeoJournal Library (Hardcover Book) [1990 edition] (1989)

Recreational Uses of Coastal Are... (1989)

Cover for Derek Mcnally · Highlights of Astronomy: As presented at the XXth General Assembly of the IAU, 1988 - International Astronomical Union Highlights (Paperback Book) [Softcover reprint of the original 1st ed. 1989 edition] (1989)

Softcover reprint of the original 1st ed. 1989 edition

Highlights of Astronomy: As pres... (1989)

Cover for J L Kaster · Aquatic Oligochaete Biology: Proceedings of the 4th International Symposium on Aquatic Oligochaete Biology - Developments in Hydrobiology (Hardcover Book) [1989 edition] (1989)

Aquatic Oligochaete Biology: Pro... (1989)

Cover for Giuseppe Arbia · Spatial Data Configuration in Statistical Analysis of Regional Economic and Related Problems - Advanced Studies in Theoretical and Applied Econometrics (Hardcover Book) [1989 edition] (1989)

Spatial Data Configuration in St... (1989)

Cover for International Conference on Ephemeroptera · Mayflies and Stoneflies: Life Histories and Biology: Proceedings of the 5th International Ephemeroptera Conference and the 9th International Plecoptera Conference - Series Entomologica (Hardcover Book) [1990 edition] (1989)

Mayflies and Stoneflies: Life Hi... (1989)

International Conference on Ephe...

Cover for Charles Hartshorne · Charles Hartshorne's Concept of God: Philosophical and Theological Responses - Studies in Philosophy and Religion (Hardcover Book) [1990 edition] (1989)

Charles Hartshorne's Concept of ... (1989)

Charles Hartshorne

Cover for Victor P Snaith · Algebraic K-Theory: Connections with Geometry and Topology - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Algebraic K-Theory: Connections ... (1989)

Victor P Snaith

Cover for G Belvedere · Accretion Disks and Magnetic Fields in Astrophysics: Proceedings of the European Physical Society Study Conference, Held in Noto (Sicily), Italy, June 16-21, 1988 - Astrophysics and Space Science Library (Hardcover Book) [1989 edition] (1989)

Accretion Disks and Magnetic Fie... (1989)

Cover for Nato Advanced Study Institute on the Ethoexperimental Analysis of Behavior · Ethoexperimental Approaches to the Study of Behavior - Nato Science Series D: (Hardcover Book) [1989 edition] (1989)

Ethoexperimental Approaches to t... (1989)

Nato Advanced Study Institute on...

Cover for Anatol Rapoport · Decision Theory and Decision Behaviour: Normative and Descriptive Approaches - Theory and Decision Library B (Hardcover Book) [1989 edition] (1989)

Decision Theory and Decision Beh... (1989)

Anatol Rapoport

Cover for Tschangho John Kim · Integrated Urban Systems Modeling: Theory and Applications - Studies in Operational Regional Science (Hardcover Book) [1989 edition] (1989)

Integrated Urban Systems Modelin... (1989)

Tschangho John Kim

Cover for Baldev Raj · Advances in Econometrics and Modelling - Advanced Studies in Theoretical and Applied Econometrics (Hardcover Book) [1989 edition] (1989)

Advances in Econometrics and Mod... (1989)

Cover for Theo M. Theophanides · Spectroscopy of Inorganic Bioactivators: Theory and Applications - Chemistry, Physics, Biology, and Medicine - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Spectroscopy of Inorganic Bioact... (1989)

Theo M. Theophanides

Cover for Stephen J Peroutka · Ecstasy: The Clinical, Pharmacological and Neurotoxicological Effects of the Drug MDMA - Topics in the Neurosciences (Hardcover Book) [1990 edition] (1989)

Ecstasy: The Clinical, Pharmacol... (1989)

Stephen J Peroutka

Cover for Steve Fuller · The Cognitive Turn: Sociological and Psychological Perspectives on Science - Sociology of the Sciences Yearbook (Hardcover Book) [1989 edition] (1989)

The Cognitive Turn: Sociological... (1989)

Cover for D. Zolo · Reflexive Epistemology: The Philosophical Legacy of Otto Neurath - Boston Studies in the Philosophy and History of Science (Hardcover Book) [1989 edition] (1989)

Reflexive Epistemology: The Phil... (1989)

Cover for Antonio Aznar Grasa · Econometric Model Selection: A New Approach - Advanced Studies in Theoretical and Applied Econometrics (Hardcover Book) [1989 edition] (1989)

Econometric Model Selection: A N... (1989)

Antonio Aznar Grasa

Cover for Anna-teresa Tymieniecka · Man's Self-Interpretation-in-Existence: Phenomenology and Philosophy of Life Introducing the Spanish Perspective - Analecta Husserliana (Hardcover Book) [1990 edition] (1990)

Man's Self-Interpretation-in-Exi... (1990)

Anna-teresa Tymieniecka

Cover for Maren Kusch · Language as Calculus vs. Language as Universal Medium: A Study in Husserl, Heidegger and Gadamer - Synthese Library (Hardcover Book) [1989 edition] (1989)

Language as Calculus vs. Languag... (1989)

Cover for George C Sih · Plasticity and failure behavior of solids: Memorial volume dedicated to the late Professor Yuriy Nickolaevich Rabotnov - Fatigue and Fracture (Hardcover Book) [1990 edition] (1990)

Plasticity and failure behavior ... (1990)

Cover for G F Bassani · Progress in Electron Properties of Solids: Festschrift in honour of Franco Bassani - Physics and Chemistry of Materials with Low-Dimensional Structures (Hardcover Book) [1989 edition] (1989)

Progress in Electron Properties ... (1989)

Cover for K. Sobczyk · Stochastic Differential Equations: With Applications to Physics and Engineering - Mathematics and its Applications (Hardcover Book) [1991 edition] (1991)

Stochastic Differential Equation... (1991)

Cover for A.V. Skorohod · Random Processes with Independent Increments - Mathematics and its Applications (Hardcover Book) [1991 edition] (1991)

Random Processes with Independen... (1991)

Cover for Margaret Leinen · Paleoclimatology and Paleometeorology: Modern and Past Patterns of Global Atmospheric Transport - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Paleoclimatology and Paleometeor... (1989)

Margaret Leinen

Cover for W E Larson · Mechanics and Related Processes in Structured Agricultural Soils - Nato Science Series E: (Hardcover Book) [1989 edition] (1989)

Mechanics and Related Processes ... (1989)

Cover for Liquid Metal Magnetohydrodynamics - Mechanics of Fluids and Transport Processes (Hardcover Book) [1989 edition] (1989)

Liquid Metal Magnetohydrodynamic... (1989)

Cover for Malcolm W. Klein · Cross-National Research in Self-Reported Crime and Delinquency - NATO Science Series D: (Hardcover Book) [1989 edition] (1989)

Cross-National Research in Self-... (1989)

Malcolm W. Klein

Cover for Theo C. Meyering · Historical Roots of Cognitive Science: The Rise of a Cognitive Theory of Perception from Antiquity to the Nineteenth Century - Synthese Library (Hardcover Book) [1989 edition] (1989)

Historical Roots of Cognitive Sc... (1989)

Theo C. Meyering

Cover for Wanda Szemplinska · The Behaviour of Nonlinear Vibrating Systems: Volume I: Fundamental Concepts and Methods; Applications to Single Degree-of-Freedom Systems Volume II: Advanced Concepts and Applications to Multi-Degree-of-Freedom Systems - Mechanics: Dynamical Systems (Hardcover Book) [1990 edition] (1990)

The Behaviour of Nonlinear Vibra... (1990)

Wanda Szemplinska

Cover for Wanda Szemplinska · The Behaviour of Nonlinear Vibrating Systems: Volume II: Advanced Concepts and Applications to Multi-Degree-of-Freedom Systems - Mechanics: Dynamical Systems (Hardcover Book) [1990 edition] (1990)

The Behaviour of Nonlinear Vibra... (1990)

Wanda Szemplinska

Cover for Charles Vlek · Social Decision Methodology for Technological Projects - Theory and Decision Library A: (Hardcover Book) [1989 edition] (1989)

Social Decision Methodology for ... (1989)

Cover for Rawal · Spinal Narcotics - Current Management of Pain (Hardcover Book) [1990 edition] (1989)

Spinal Narcotics - Current Manag... (1989)

Cover for Marcello Felli · Very Long Baseline Interferometry: Techniques and Applications - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Very Long Baseline Interferometr... (1989)

Cover for Vervliet · ABHB Annual Bibliography of the History of the Printed Book and Libraries: Volume 18: Publications of 1987 and additions from the preceding years - Annual Bibliography of the History of the Printed Book and Libraries (Hardcover Book) [1989 edition] (1989)

ABHB Annual Bibliography of the ... (1989)

Cover for Peter Kosso · Observability and Observation in Physical Science - Synthese Library (Hardcover Book) (1989)

Observability and Observation in... (1989)

Cover for R.D. Gallie · Thomas Reid and 'The Way of Ideas' - Philosophical Studies Series (Hardcover Book) [1989 edition] (1989)

Thomas Reid and 'The Way of Idea... (1989)

Cover for Urban Dynamics and Spatial Choice Behaviour - Theory and Decision Library (Hardcover Book) [1989 edition] (1989)

Urban Dynamics and Spatial Choic... (1989)

Cover for Oceanic Circulation Models: Combining Data and Dynamics - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Oceanic Circulation Models: Comb... (1989)

Cover for Robert S. Liptser · Theory of Martingales - Mathematics and its Applications (Hardcover Book) [1989 edition] (1989)

Theory of Martingales - Mathemat... (1989)

Robert S. Liptser

Cover for C.T. Sistare · Responsibility and Criminal Liability - Law and Philosophy Library (Hardcover Book) [1989 edition] (1989)

Responsibility and Criminal Liab... (1989)

Cover for B. Rollet · Stratification of tropical forests as seen in leaf structure: Part 2 - Tasks for Vegetation Science (Hardcover Book) [1990 edition] (1990)

Stratification of tropical fores... (1990)

Cover for Nato Advanced Study Institute on Social Competence in Developmental Perspective · Social Competence in Developmental Perspective - NATO Science Series D: (Hardcover Book) [1989 edition] (1989)

Social Competence in Development... (1989)

Nato Advanced Study Institute on...

Cover for K.A. Spencer · Host Specialization in the World Agromyzidae (Diptera) - Series Entomologica (Hardcover Book) [1990 edition] (1990)

Host Specialization in the World... (1990)

Cover for Andre L Berger · Climate and Geo-Sciences: A Challenge for Science and Society in the 21st Century - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Climate and Geo-Sciences: A Chal... (1989)

Cover for Yirmiyahu Yovel · Kant's Practical Philosophy Reconsidered: Papers presented at the Seventh Jerusalem Philosophical Encounter, December 1986 - International Archives of the History of Ideas / Archives Internationales d'Histoire des Idees (Hardcover Book) [1989 edition] (1989)

Kant's Practical Philosophy Reco... (1989)

Yirmiyahu Yovel

Cover for Di Castri · Biological Invasions in Europe and the Mediterranean Basin - Monographiae Biologicae (Hardcover Book) [1990 edition] (1990)

Biological Invasions in Europe a... (1990)

Cover for A L Berger · Climate and Geo-Sciences: A Challenge for Science and Society in the 21st Century - NATO Science Series C (Paperback Book) [Softcover reprint of the original 1st ed. 1989 edition] (1989)

Softcover reprint of the original 1st ed. 1989 edition

Climate and Geo-Sciences: A Chal... (1989)

Cover for Richard H Thomason · Philosophical Logic and Artificial Intelligence (Hardcover Book) [Partly reprinted from JOURNAL OF PHILOSOPHICAL LOG edition] (1989)

Partly reprinted from JOURNAL OF PHILOSOPHICAL LOG edition

Philosophical Logic and Artifici... (1989)

Richard H Thomason

Cover for Lucien M Brush · Taming the Yellow River: Silt and Floods: Proceedings of a Bilateral Seminar on Problems in the Lower Reaches of the Yellow River, China - GeoJournal Library (Hardcover Book) [1989 edition] (1989)

Taming the Yellow River: Silt an... (1989)

Cover for T. Pawlowski · Aesthetic Values - Nijhoff International Philosophy Series (Hardcover Book) [1989 edition] (1989)

Aesthetic Values - Nijhoff Inter... (1989)

Cover for Trevor H Levere · Nature, Experiment, and the Sciences: Essays on Galileo and the History of Science in Honour of Stillman Drake - Boston Studies in the Philosophy and History of Science (Hardcover Book) [1990 edition] (1990)

Nature, Experiment, and the Scie... (1990)

Trevor H Levere

Cover for Elisabeth M H Mathus-vliegen · The Role of Laser in Gastroenterology: Analysis of Eight years' experience - Developments in Gastroenterology (Hardcover Book) [1989 edition] (1989)

The Role of Laser in Gastroenter... (1989)

Elisabeth M H Mathus-vliegen

Cover for Monin · Theoretical Geophysical Fluid Dynamics - Environmental Fluid Mechanics (Hardcover Book) [1990 edition] (1990)

Theoretical Geophysical Fluid Dy... (1990)

Cover for David J Cole · Philosophy, Mind, and Cognitive Inquiry: Resources for Understanding Mental Processes - Studies in Cognitive Systems (Hardcover Book) [1990 edition] (1990)

Philosophy, Mind, and Cognitive ... (1990)

Cover for E.H. Pearce · Parameters in Old French Syntax: Infinitival Complements: Infinitival Complements - Studies in Natural Language and Linguistic Theory (Hardcover Book) [1990 edition] (1990)

Parameters in Old French Syntax:... (1990)

Cover for E.H. Pearce · Parameters in Old French Syntax: Infinitival Complements: Infinitival Complements - Studies in Natural Language and Linguistic Theory (Paperback Book) [Softcover reprint of the original 1st ed. 1990 edition] (1990)

Softcover reprint of the original 1st ed. 1990 edition

Parameters in Old French Syntax:... (1990)

Cover for T Terziogammalu · Advances in the Theory of Frechet Spaces - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Advances in the Theory of Freche... (1989)

T Terziogammalu

Cover for R W Perrett · Indian Philosophy of Religion - Studies in Philosophy and Religion (Hardcover Book) [1989 edition] (1989)

Indian Philosophy of Religion - ... (1989)

Cover for Enno Freye · Cerebral Monitoring in the Operating Room and the Intensive Care Unit - Developments in Critical Care Medicine and Anaesthesiology (Hardcover Book) [1990 edition] (1990)

Cerebral Monitoring in the Opera... (1990)

Cover for George S Abela · Lasers in Cardiovascular Medicine and Surgery: Fundamentals and Techniques - Developments in Cardiovascular Medicine (Hardcover Book) [1990 edition] (1990)

Lasers in Cardiovascular Medicin... (1990)

Cover for M. I. Rabinovich · Oscillations and Waves: in Linear and Nonlinear Systems - Mathematics and its Applications (Hardcover Book) [1989 edition] (1989)

Oscillations and Waves: in Linea... (1989)

M. I. Rabinovich

Cover for J. Watt · Individualism and Educational Theory - Philosophy and Education (Hardcover Book) [1989 edition] (1989)

Individualism and Educational Th... (1989)

Cover for International Astronomical Union · Interstellar Dust: Proceedings of the 135th Symposium of the International Astronomical Union, Held in Santa Clara, California, July 26-30, 1988 - International Astronomical Union Symposia (Hardcover Book) [1989 edition] (1989)

Interstellar Dust: Proceedings o... (1989)

International Astronomical Union

Cover for L J Allamandola · Interstellar Dust: Proceedings of the 135th Symposium of the International Astronomical Union, Held in Santa Clara, California, July 26-30, 1988 - International Astronomical Union Symposia (Paperback Book) [Softcover reprint of the original 1st ed. 1989 edition] (1989)

Softcover reprint of the original 1st ed. 1989 edition

Interstellar Dust: Proceedings o... (1989)

L J Allamandola

Cover for Smith, J C, Qc · Historical Foundations of Cognitive Science - Philosophical Studies Series (Hardcover Book) [1990 edition] (1990)

Historical Foundations of Cognit... (1990)

Cover for Dieter Schinzer · Selectivities in Lewis Acid Promoted Reactions - NATO Science Series C (Hardcover Book) [1989 edition] (1989)

Selectivities in Lewis Acid Prom... (1989)

Dieter Schinzer

Cover for V Tejera · History and Anti-History in Philosophy - Nijhoff International Philosophy Series (Hardcover Book) [1989 edition] (1989)

History and Anti-History in Phil... (1989)

Cover for T.L. White · Predicting Breeding Values with Applications in Forest Tree Improvement - Forestry Sciences (Hardcover Book) [1989 edition] (1989)

Predicting Breeding Values with ... (1989)

Cover for P.g Aaron · Reading and Writing Disorders in Different Orthographic Systems - NATO Science Series D: (Hardcover Book) [1989 edition] (1989)

Reading and Writing Disorders in... (1989)

Cover for R. Wohlleben · Interferometry in Radioastronomy and Radar Techniques (Hardcover Book) [1991 edition] (1990)

Interferometry in Radioastronomy... (1990)

Cover for J. Rouwendal · Choice and Allocation Models for the Housing Market - Studies in Operational Regional Science (Hardcover Book) [1989 edition] (1989)

Choice and Allocation Models for... (1989)

Cover for R. Cobb-Stevens · Husserl and Analytic Philosophy - Phaenomenologica (Hardcover Book) [1990 edition] (1990)

Husserl and Analytic Philosophy ... (1990)

R. Cobb-Stevens