This very good monograph contains some of the most recent important developments in the oscillation theory of differential equations with deviating arguments. ... The book is well written ... and reads well. ... This book is self-contained and provides an excellent reference to the recent work for research workers in this interesting field. * ZAMP, vol.45, 1994. * very good monograph ... The book is well written ... and reads well. * I.P. Stavroulakis, ZAMP, Vol. 45-6 * contains extensive treatment of equations arising in models for such systems ... quite self-contained; detailed proofs are given for most results * George Seifert, Iowa State University, SIAM Review * 'Here is a good book in the area of functional differential equations, which will serve as a reference book and a working tool for researchers as well as for the training of students ... the whole book has a unity ... the book is self-contained, moreover each chapter itself is nearly self-contained.' Mathematics Abstracts, 780/94 'This book provides an excellent introduction to the theory for a graduate student or other beginner in this field and it incorporates a large amount of very recent research.' Mathematika