%0 Journal Article %A O. A. Liskovets %T Method of $\varepsilon $-quasisolutions for equations of the first kind %J Differencialʹnye uravneniâ %D 1973 %P 1851-1861 %V 9 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1973_9_10_a12/ %G ru %F DE_1973_9_10_a12