%0 Journal Article %A V. N. Pavlenko %A O. V. Ul'yanova %T Method of Upper and Lower Solutions for Parabolic-Type Equations with Discontinuous Nonlinearities %J Differencialʹnye uravneniâ %D 2002 %P 499-504 %V 38 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2002_38_4_a8/ %G ru %F DE_2002_38_4_a8