%0 Journal Article %A A. P. Begun %T Nondenseness of a set of equations with singular periodic solutions %J Differencialʹnye uravneniâ %D 1995 %P 1434-1435 %V 31 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1995_31_8_a19/ %G ru %F DE_1995_31_8_a19