%0 Journal Article %A A. P. Abramov %T Existence of nonregular points in a model of external debt %J Differencialʹnye uravneniâ %D 1996 %P 1701-1702 %V 32 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1996_32_12_a15/ %G ru %F DE_1996_32_12_a15