@article{MZM_1973_14_5_a11,
     author = {Ya. A. Kofner},
     title = {Symmetrizable spaces and factor mappings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {713--722},
     publisher = {mathdoc},
     volume = {14},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_5_a11/}
}