%0 Journal Article %A N. N. Nefedov %T An asymptotic method of differential inequalities for the investigation of periodic contrast structures: Existence, asymptotics, and stability %J Differencialʹnye uravneniâ %D 2000 %P 262-269 %V 36 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2000_36_2_a15/ %G ru %F DE_2000_36_2_a15