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@article{DAN_1962_142_5_a22, author = {V. A. Chikin}, title = {A generalization of a theorem of {Huygens}}, journal = {Doklady Akademii Nauk}, pages = {1058--1060}, publisher = {mathdoc}, volume = {142}, number = {5}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_142_5_a22/} }
V. A. Chikin. A generalization of a theorem of Huygens. Doklady Akademii Nauk, Tome 142 (1962) no. 5, pp. 1058-1060. http://geodesic.mathdoc.fr/item/DAN_1962_142_5_a22/