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Functional Approach to Nonlinear Models of Water Flow in Soils MATHEMATICAL MODELLING: Theory and Applications VOLUME 21 This series is aimed at publishing work dealing with the definition, development and application of fundamental theory and methodology, computational and algorithmic implementations and comprehensive empirical studies in mathematical modelling. Work on new mathematics inspired by the construction of mathematical models, combining theory and experiment and furthering the understanding of the systems being modelled are particularly welcomed. Manuscripts to be considered for publication lie within the following, non-exhaustive list of areas: mathematical modelling in engineering, industrial mathematics, control theory, operations research, decision theory, economic modelling, mathematical programmering, mathematical system theory, geophysical sciences, climate modelling, environmental processes, mathematical modelling in psychology, political science, sociology and behavioural sciences, mathematical biology, mathematical ecology, image processing, computer vision, artificial intelligence, fuzzy systems, and approximate reasoning, genetic algorithms, neural networks, expert systems, pattern recognition, clustering, chaos and fractals. Original monographs, comprehensive surveys as well as edited collections will be considered for publication. Editor: R. Lowen (Antwerp, Belgium) Editorial Board: J.-P. Aubin (Université de Paris IX, France) E. Jouini (Université Paris IX - Dauphine, France) G.J. Klir (New York, U.S.A.) P.G. Mezey (Saskatchewan, Canada) F. Pfeiffer (München, Germany) A. Stevens (Max Planck Institute for Mathematics in the Sciences, Leipzig, Germany) H.-J. Zimmerman (Aachen, Germany) The titles published in this series are listed at the end of this volume. Functional Approach to Nonlinear Models of Water Flow in Soils by Gabri