Asymptotic methods of nonlinear mechanics developed by N. M. Krylov and N. N. Bogoliubov originated new trend in perturbation theory. They pene- trated deep into various applied branches (theoretical physics, mechanics, ap- plied astronomy, dynamics of space flights, and others) and laid the founda- tion for lrumerous generalizations and for the creation of various modifications of thesem. E f, hods. A great number of approaches and techniques exist and many differen. t classes of mathematical objects have been considered (ordinary differential equations, partial differential equations, delay diffe, 'ential equations and others). The stat. e of studying related problems was described in mono- graphs and original papers of Krylov N. M., Bogoliubov N. N. 1], 2], Bogoli- ubov N. N 1J, Bogoliubov N. N., Mitropolsky Yu. A. 1], Bogoliubov N. N., Mitropol- sky Yu. A., Samoilenko A. M. 1], Akulenko L. D. 1], van den Broek B. 1], van den Broek B., Verhulst F. 1], Chernousko F. L., Akulenko L. D. and Sokolov B. N. 1], Eckhause W. l], Filatov A. N. 2], Filatov A. N., Shershkov V. V. 1], Gi- acaglia G. E. O. 1], Grassman J. 1], Grebennikov E. A. 1], Grebennikov E. A., Mitropolsky Yu. A. 1], Grebennikov E. A., Ryabov Yu. A. 1], Hale J . K. I]' Ha- paev N. N. 1], Landa P. S. 1), Lomov S. A. 1], Lopatin A. K. 22]- 24], Lykova O. B.
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