%0 Journal Article %A A. Dzhuraev %T On the theory of overdetermined first-order systems %J Doklady Akademii Nauk %D 1991 %P 664-669 %V 321 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1991_321_4_a4/ %G ru %F DAN_1991_321_4_a4