%0 Journal Article %A V. M. Kharlamov %T Isotopic types of nonsingular surfaces of fourth degree in $\mathbb{RP}^3$ %J Funkcionalʹnyj analiz i ego priloženiâ %D 1978 %P 86-87 %V 12 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1978_12_1_a17/ %G ru %F FAA_1978_12_1_a17