%0 Journal Article
%A E. S. Chichkin
%T On the non-oscillation of solutions of non-linear differential equations of third and fourth order
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1959
%P 219-221
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1959_5_a22/
%G ru
%F IVM_1959_5_a22