%0 Journal Article %A S. A. Brykalov %T Plane sets and nonlinear boundary value problems %J Doklady Akademii Nauk %D 1995 %P 449-451 %V 342 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1995_342_4_a3/ %G ru %F DAN_1995_342_4_a3