@article{VMUMM_1994_4_a6,
     author = {A. V. Ostrovsky},
     title = {On new classes of mappings associated with $k$-covering mappings},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {24--28},
     publisher = {mathdoc},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1994_4_a6/}
}