@article{PMFA_1960_5_1_a2,
     author = {Boltjanskij,~V.~G. and Jefremovi\v{c}, V.A.},
     title = {O topologii. {III}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {7--27},
     year = {1960},
     volume = {5},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1960_5_1_a2/}
}