Upper estimates for the Lyusternik--Shnirelman's category
Doklady Akademii Nauk, Tome 136 (1961) no. 6, pp. 1273-1376.

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     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/}
}
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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/