Geodesic
Ranks of families of sets and properties of topological spaces
Doklady Akademii Nauk, Tome 257 (1981) no. 4, pp. 777-779.

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     author = {P. A. Biryukov},
     title = {Ranks of families of sets and properties of topological spaces},
     journal = {Doklady Akademii Nauk},
     pages = {777--779},
     publisher = {mathdoc},
     volume = {257},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_257_4_a0/}
}
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P. A. Biryukov. Ranks of families of sets and properties of topological spaces. Doklady Akademii Nauk, Tome 257 (1981) no. 4, pp. 777-779. http://geodesic.mathdoc.fr/item/DAN_1981_257_4_a0/