%0 Journal Article %A V. R. Portnov %T The first boundary value problem for a certain class of quasilinear systems of equations that have divergence form %J Doklady Akademii Nauk %D 1970 %P 285-288 %V 195 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1970_195_2_a6/ %G ru %F DAN_1970_195_2_a6