@article{DAN_1968_178_3_a4,
     author = {B. Efimov},
     title = {Mappings of zero-dimensional bicompacta},
     journal = {Doklady Akademii Nauk},
     pages = {525--528},
     publisher = {mathdoc},
     volume = {178},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a4/}
}