%0 Journal Article %A E. V. Mamotov %T Some properties of a system of first-order ordinary differential nonlinear equations with a singular matrix of constant rank in front of the vector of the derivatives %J Differencialʹnye uravneniâ %D 1988 %P 1055-1058 %V 24 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_6_a21/ %G ru %F DE_1988_24_6_a21