@article{DAN_1967_176_6_a8,
     author = {A. Lelek},
     title = {An estimate of the defect of a space},
     journal = {Doklady Akademii Nauk},
     pages = {1244--1246},
     year = {1967},
     volume = {176},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_176_6_a8/}
}