%0 Journal Article %A A. F. Philippov %T Structural instability of three-dimensional systems in an open domain of the parameter space %J Differencialʹnye uravneniâ %D 1987 %P 538-539 %V 23 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1987_23_3_a30/ %G ru %F DE_1987_23_3_a30