%0 Journal Article %A I. P. Martynov %T Third-order systems without moving critical singularities %J Differencialʹnye uravneniâ %D 1986 %P 209-215 %V 22 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1986_22_2_a4/ %G ru %F DE_1986_22_2_a4