@article{IVM_2017_3_a8,
     author = {R. G. Nasibullin and I. K. Shafigullin},
     title = {Avkhadiev--Becker type multivalence conditions for harmonic mappings of a disc},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {84--88},
     publisher = {mathdoc},
     number = {3},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2017_3_a8/}
}