@article{GDZPPN002416514, title = {On the Lusternik-Schnirelmann Category of Lie Groups.}, journal = {Mathematische Zeitschrift}, volume = {142}, year = {1975}, pages = {111-116}, zbl = {0315.55012}, url = {http://dml.mathdoc.fr/item/GDZPPN002416514} }
Singhof, Wilhelm. On the Lusternik-Schnirelmann Category of Lie Groups.. Mathematische Zeitschrift, Tome 142 (1975) pp. 111-116. http://gdmltest.u-ga.fr/item/GDZPPN002416514/