%0 Journal Article %A V. I. Tsygankov %T Equations of $G$-minimal conic bundles with degree $4$ %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2010 %P 39-42 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2010_2_a6/ %G ru %F VMUMM_2010_2_a6