%0 Journal Article
%A Nguyên van Dao
%T On the oscillations of systems which are nearly essentially nonlinear
%J Doklady Akademii Nauk
%D 1970
%P 1004-1006
%V 192
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_192_5_a14/
%G ru
%F DAN_1970_192_5_a14