@article{VMUMM_1984_4_a6,
     author = {V. V. Tkachuk},
     title = {A supertopological cardinal invariant},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {26--29},
     publisher = {mathdoc},
     number = {4},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1984_4_a6/}
}