%0 Journal Article
%A V. V. Filippov
%T An investigation of stationary points in a plane
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 1993
%P 3-11
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VMUMM_1993_5_a0/
%G ru
%F VMUMM_1993_5_a0