%0 Journal Article
%A I. A. Konoplyannik
%T A certain class of third order systems without movable critical points
%J Differencialʹnye uravneniâ
%D 1975
%P 1508-1511
%V 11
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_8_a18/
%G ru
%F DE_1975_11_8_a18