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@article{MZM_1986_39_6_a8, author = {D. B. Shakhmatov}, title = {Precalibers of $\sigma$-compact topological groups}, journal = {Matemati\v{c}eskie zametki}, pages = {859--868}, publisher = {mathdoc}, volume = {39}, number = {6}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_6_a8/} }
D. B. Shakhmatov. Precalibers of $\sigma$-compact topological groups. Matematičeskie zametki, Tome 39 (1986) no. 6, pp. 859-868. http://geodesic.mathdoc.fr/item/MZM_1986_39_6_a8/