@article{IVM_1997_10_a6,
     author = {I. M. Kotsur and M. F. Kotsur},
     title = {The radius of $n$-valent convexity and starlikeness for some special classes of analytical functions on a~disk},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {48--50},
     year = {1997},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1997_10_a6/}
}