%0 Journal Article %A A. D. Myshkis %A V. G. Èventov %T A geometric treatment of the oscillatory properties of third order linear differential equations %J Differencialʹnye uravneniâ %D 1977 %P 1047-1052 %V 13 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_6_a8/ %G ru %F DE_1977_13_6_a8