%0 Journal Article %A A. P. Oskolkov %T Interior estimates of the first derivatives for a certain class of quasilinear elliptic systems %J Informatics and Automation %D 1970 %P 102-106 %V 110 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1970_110_a5/ %G ru %F TRSPY_1970_110_a5