Voir la notice de l'article provenant de la source Math-Net.Ru
@article{FAA_1974_8_2_a23, author = {G. A. Utkin}, title = {Construction of an $M$-surface of fourth order in $\mathbb{RP}^3$}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {91--92}, publisher = {mathdoc}, volume = {8}, number = {2}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1974_8_2_a23/} }
G. A. Utkin. Construction of an $M$-surface of fourth order in $\mathbb{RP}^3$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 8 (1974) no. 2, pp. 91-92. http://geodesic.mathdoc.fr/item/FAA_1974_8_2_a23/