This monograph is an introduction to boundary value problems for linear differential operators on graphs/networks. ... the text introduces the reader to the techniques of partial differential operator theory that carry over differential equations on graphs. It is well written and makes pleasant reading. (Bruce A. Watson, Mathematical Reviews, November, 2015) The book under review uses an operator theoretical approach to study dynamical processes in networks. ... The book is aimed at researchers and graduate students having some general knowledge in operator theory. ... We believe that it can serve as a textbook for a graduate course, as well as a comprehensive handbook for researchers in the field. (Marjeta Kramar Fijavz, zbMATH 1306.47001, 2015)