@article{VMUMM_1986_2_a4,
     author = {A. V. Arkhangel'skii},
     title = {Twin theorems estimating the cardinality of a topological space},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {24--26},
     publisher = {mathdoc},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1986_2_a4/}
}