Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{PMFA_1959__4_4_a1, author = {Boltyanskij, V.G. and Yefremovich, V. A.}, title = {O topologii. {II}}, journal = {Pokroky matematiky, fyziky a astronomie}, pages = {394--421}, publisher = {mathdoc}, volume = {04}, number = {4}, year = {1959}, zbl = {0229.54002}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/PMFA_1959__4_4_a1/} }
Boltyanskij, V.G.; Yefremovich, V. A. O topologii. II. Pokroky matematiky, fyziky a astronomie, Tome 04 (1959) no. 4, pp. 394-421. http://geodesic.mathdoc.fr/item/PMFA_1959__4_4_a1/