V. Lakshmikantham et Aa. Martynyuk, DEVELOPMENT OF THE DIRECT LYAPUNOV METHOD FOR DELAY SYSTEMS (SURVEY), International applied mechanics, 29(2), 1993, pp. 83-96
The year 1992 marks a century from the publication of Lyapunov's origi
nal work. It is of interest to analyze the state-of-the-art of the the
ory of stability for delay systems, developed up to now on the basis o
f Lyapunov's direct method. In this survey we give a systematic exposi
tion of the recent development directions and we present a unified app
roach that can be applied for the analysis of various nonlinear delay
systems.