%0 Journal Article %A G. N. Chermalykh %T Conditions for the existence of solutions of the equations of the type of the differential method equations %J Teoretičeskaâ i matematičeskaâ fizika %D 1972 %P 215-222 %V 10 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1972_10_2_a6/ %G ru %F TMF_1972_10_2_a6