%0 Journal Article %A A. D. Dzhabrailov %T An investigation of certain classes of second order quasilinear elliptic equations. I %J Differencialʹnye uravneniâ %D 1969 %P 2245-2257 %V 5 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1969_5_12_a10/ %G ru %F DE_1969_5_12_a10