@article{SM_1968_5_4_a1,
     author = {V. V. Fedorchuk},
     title = {Perfect irreducible mappings and generalized proximities},
     journal = {Sbornik. Mathematics},
     pages = {489--508},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1968_5_4_a1/}
}