@article{MZ_1976__151_172439,
     author = {Wilhelm Singhof},
     title = {On the {Lusternik-Schnirelmann} {Category} of {Lie} {Groups:} {II.}},
     journal = {Mathematische Zeitschrift},
     pages = {143--148},
     publisher = {mathdoc},
     volume = {151},
     year = {1976},
     zbl = {0343.55007},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__151_172439/}
}