@article{IVM_1969_8_a9,
     author = {I. Yu. Ryzhakov},
     title = {The trigonometrical analogue of a~problem of {E.} {I.~Zolotarev}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {75--88},
     year = {1969},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_8_a9/}
}