%0 Journal Article %A M. V. Zaretskii %T Lagrange's differential equation %J Differencialʹnye uravneniâ %D 1968 %P 1065-1070 %V 4 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1968_4_6_a11/ %G ru %F DE_1968_4_6_a11