@article{MZM_1971_9_2_a2,
     author = {A. L. Levin},
     title = {Approximation by rational functions in complex regions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {121--130},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_2_a2/}
}