From the reviews of the first edition: "The present book ... gives an up to date overview of recent developments, especially focusing on work done in the countries of the former Soviet Union. In this respect it is a gold mine for readers who have already some similarity with the theory of nonlinear oscillations, because 375 references are listed. ... For those readers who want to get an overview on modern developments of oscillation theory and their applications in the sciences, the book will be certainly an excellent choice." (H. Troger, Zentralblatt MATH, Vol. 980, 2002)