%0 Journal Article
%A I. I. Pleshkan
%T On the problem of isochronism for systems with discontinuous right-hand sides
%J Differencialʹnye uravneniâ
%D 1974
%P 647-658
%V 10
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1974_10_4_a9/
%G ru
%F DE_1974_10_4_a9