%0 Journal Article %A Kh. Yu. Kurdanov %T An upper estimate for the solutions of a nonlinear first order equation of lagging type %J Differencialʹnye uravneniâ %D 1971 %P 2283-2284 %V 7 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1971_7_12_a22/ %G ru %F DE_1971_7_12_a22