@article{GDZPPN002069199, title = {Rank and symmetry of Riemannian manifolds.}, journal = {Commentarii mathematici Helvetici}, volume = {69}, year = {1994}, pages = {483-500}, zbl = {0822.53032}, url = {http://dml.mathdoc.fr/item/GDZPPN002069199} }
Eschenburg, J.-H.; Olmos, C. Rank and symmetry of Riemannian manifolds.. Commentarii mathematici Helvetici, Tome 69 (1994) pp. 483-500. http://gdmltest.u-ga.fr/item/GDZPPN002069199/