@article{1029001423, author = {D'Atri, J. E.}, title = {Geodesic spheres and symmetries in naturally reductive spaces.}, journal = {Michigan Math. J.}, volume = {21}, number = {3}, year = {1975}, pages = { 71-76}, language = {en}, url = {http://dml.mathdoc.fr/item/1029001423} }
D'Atri, J. E. Geodesic spheres and symmetries in naturally reductive spaces.. Michigan Math. J., Tome 21 (1975) no. 3, pp. 71-76. http://gdmltest.u-ga.fr/item/1029001423/