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@article{IVM_1977_4_a5, author = {B. A. Kats}, title = {Convexity and starlikeness of the level curves of rational {functions.~II}}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {44--52}, publisher = {mathdoc}, number = {4}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1977_4_a5/} }
B. A. Kats. Convexity and starlikeness of the level curves of rational functions.~II. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1977), pp. 44-52. http://geodesic.mathdoc.fr/item/IVM_1977_4_a5/