@article{SM_1969_7_4_a8,
     author = {A. A. Gonchar},
     title = {Zolotarev problems connected with rational functions},
     journal = {Sbornik. Mathematics},
     pages = {623--635},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1969_7_4_a8/}
}