%0 Journal Article %A Y. S. Popkov %T Oscillations in Dynamic Systems with an Entropy Operator %J Russian journal of nonlinear dynamics %D 2023 %P 125-135 %V 19 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2023_19_1_a7/ %G en %F ND_2023_19_1_a7