@article{CMH_1994__69_4_140350,
     author = {J.-H. Eschenburg and C. Olmos},
     title = {Rank and symmetry of {Riemannian} manifolds.},
     journal = {Commentarii mathematici Helvetici},
     pages = {483--500},
     year = {1994},
     volume = {69},
     number = {4},
     zbl = {0822.53032},
     url = {http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140350/}
}