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@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/} }
V. Fedorchuk. $\theta$-spaces and perfect irreducible mappings of topological spaces. Doklady Akademii Nauk, Tome 174 (1967) no. 4, pp. 757-759. http://geodesic.mathdoc.fr/item/DAN_1967_174_4_a5/