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@article{DAN_1962_146_4_a6, author = {V. S. Malakhovskii}, title = {On a class of congruences of second-order curves with a degenerate focal surface}, journal = {Doklady Akademii Nauk}, pages = {765--766}, publisher = {mathdoc}, volume = {146}, number = {4}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_146_4_a6/} }
V. S. Malakhovskii. On a class of congruences of second-order curves with a degenerate focal surface. Doklady Akademii Nauk, Tome 146 (1962) no. 4, pp. 765-766. http://geodesic.mathdoc.fr/item/DAN_1962_146_4_a6/