%0 Journal Article
%A F. K. Zakirov
%T Solutions that are finally of constant sign for nonlinear differential equations with lag
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1975
%P 108-111
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1975_2_a12/
%G ru
%F IVM_1975_2_a12