%0 Journal Article %A M. T. Terekhin %T Existence of a fixed point of a nonlinear operator %J Differencialʹnye uravneniâ %D 1984 %P 1561-1565 %V 20 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1984_20_9_a11/ %G ru %F DE_1984_20_9_a11