%0 Journal Article %A V. M. Anikin %T > of Saratov University Department of Physics and Mathematics. 1917--1945 %J Izvestiya VUZ. Applied Nonlinear Dynamics %D 2018 %P 5-19 %V 26 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVP_2018_26_6_a1/ %G ru %F IVP_2018_26_6_a1