From the reviews of the second edition: "The book is an updated version of the book 'Non-Archimedean L-Functions of Hilbert and Siegel Modular Forms' by Alexei Panchishkin published in 1991 ... . The main subject of the book is the p-adic theory of L-functions of Siegel modular forms. ... The basic new feature of this second version is the use of arithmetical nearly holomorphic Siegel modular forms ... . The book will be very useful for postgraduate students and researchers entering this difficult area of research." (Andrzej Dabrowski, Zentralblatt MATH, Vol. 1070, 2005)