%0 Journal Article %A N. N. Ural'tseva %T Nonlinear boundary value problems for equations of minimal surface type %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1971 %P 217-226 %V 116 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1971_116_a13/ %G ru %F TM_1971_116_a13