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@article{DAN_1974_216_4_a8, author = {I. Yu. Ryzhakov}, title = {An analog for the disk of {Zolotarev's} problem}, journal = {Doklady Akademii Nauk}, pages = {740--743}, publisher = {mathdoc}, volume = {216}, number = {4}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_4_a8/} }
I. Yu. Ryzhakov. An analog for the disk of Zolotarev's problem. Doklady Akademii Nauk, Tome 216 (1974) no. 4, pp. 740-743. http://geodesic.mathdoc.fr/item/DAN_1974_216_4_a8/