From the reviews: "The book under review makes its appearance about a decade after its subject became one of the hot topics in nonlinear wave theory. ... The book contains a comprehensive review of the respective theoretical results obtained using either numerical methods or the semi-analytical variational approach. ... The timely appearance of this book, as well as the wide range of physical problems addressed, makes the work a valuable reference for a broad audience interested in recent developments in the theory of nonlinear waves and its applications." (Vladimir V. Konotop, Mathematical Reviews, Issue 2012 b)