9781461265849 | Reprint edition (Birkhauser, October 31, 2012), cover price $139.00 | About this edition: This book is a self-contained presentation of the background and progress of the study of time-delay systems, a subject with broad applications to a number of areas.

9780817642129 | Birkhauser, August 1, 2003, cover price $199.00

9783540208907 | Springer Verlag, June 30, 2004, cover price $249.00 | About this edition: In the mathematical description of a physical or biological process, it is a common practice \0 assume that the future behavior of Ihe process considered depends only on the present slate, and therefore can be described by a finite sct of ordinary diffe­ rential equations.