Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1961_136_6_a2, author = {Tudor Ganea}, title = {Upper estimates for the {Lyusternik--Shnirelman's} category}, journal = {Doklady Akademii Nauk}, pages = {1273--1376}, publisher = {mathdoc}, volume = {136}, number = {6}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_6_a2/} }
Tudor Ganea. Upper estimates for the Lyusternik--Shnirelman's category. Doklady Akademii Nauk, Tome 136 (1961) no. 6, pp. 1273-1376. http://geodesic.mathdoc.fr/item/DAN_1961_136_6_a2/