@article{VMUMM_1988_4_a20,
     author = {V. A. Matveev},
     title = {Perfect irreducible pre-images of topological spaces},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {80--82},
     publisher = {mathdoc},
     number = {4},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_4_a20/}
}