%0 Journal Article %A A. V. Kozulin %T A third order differential equation with six singular points %J Differencialʹnye uravneniâ %D 1987 %P 1997-1998 %V 23 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1987_23_11_a19/ %G ru %F DE_1987_23_11_a19