@article{IVM_1969_6_a1,
     author = {L. Kh. Burshtein},
     title = {Extremal problems for certain classes of analytic functions.},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {9--16},
     year = {1969},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_6_a1/}
}