%0 Journal Article
%A V. L. Lubih
%T The existence of a local invariant surface in the absence of linear approximation
%J Differencialʹnye uravneniâ
%D 1971
%P 1410-1418
%V 7
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1971_7_8_a7/
%G ru
%F DE_1971_7_8_a7