@article{DAN_1963_148_5_a5,
     author = {A. Zarelua and Yu. Smirnov},
     title = {On essential and zero-dimensional mappings},
     journal = {Doklady Akademii Nauk},
     pages = {1017--1019},
     publisher = {mathdoc},
     volume = {148},
     number = {5},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_5_a5/}
}