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@article{DAN_1967_173_3_a11, author = {G. N. Tyurina}, title = {On a type of contractible curves}, journal = {Doklady Akademii Nauk}, pages = {529--531}, publisher = {mathdoc}, volume = {173}, number = {3}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_173_3_a11/} }
G. N. Tyurina. On a type of contractible curves. Doklady Akademii Nauk, Tome 173 (1967) no. 3, pp. 529-531. http://geodesic.mathdoc.fr/item/DAN_1967_173_3_a11/