%0 Journal Article %A A. Yu. Aleksandrov %T Investigation of recurrent oscillations of dynamical systems %J Differencialʹnye uravneniâ %D 1998 %P 1011-1017 %V 34 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1998_34_8_a0/ %G ru %F DE_1998_34_8_a0