%0 Journal Article %A M. N. Popa %T Syzygies between the affine invariants of a system with quadratic right hand sides %J Differencialʹnye uravneniâ %D 1977 %P 2272-2275 %V 13 %N 12 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_12_a17/ %G ru %F DE_1977_13_12_a17