%0 Journal Article %A V. A. Malyshev %T Wiener--Hopf equations in a~quadrant of the plane, discrete groups, and automorphic functions %J Sbornik. Mathematics %D 1971 %P 491-516 %V 13 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1971_13_4_a0/ %G en %F SM_1971_13_4_a0