%0 Journal Article %T In memory of Professor Alexey V. Borisov (27.03.1965–24.01.2021) %J Russian journal of nonlinear dynamics %D 2021 %P 3 %V 17 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2021_17_1_a0/ %G en %F ND_2021_17_1_a0