%0 Journal Article %A A. I. Ogurtsov %T On the stability of the solutions of certain non-linear differential equations of third and fourth order %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1959 %P 200-209 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1959_3_a18/ %G ru %F IVM_1959_3_a18