@article{DAN_1967_174_4_a5,
     author = {V. Fedorchuk},
     title = {$\theta$-spaces and perfect irreducible mappings of topological spaces},
     journal = {Doklady Akademii Nauk},
     pages = {757--759},
     publisher = {mathdoc},
     volume = {174},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_174_4_a5/}
}