@article{1273844778, author = {Sakamoto, Kunio}, title = {Doubly Warped Product And The Periodicity Of Geodesics}, journal = {Nihonkai Math. J.}, volume = {5}, number = {2}, year = {1994}, pages = { 69-99}, language = {en}, url = {http://dml.mathdoc.fr/item/1273844778} }
Sakamoto, Kunio. Doubly Warped Product And The Periodicity Of Geodesics. Nihonkai Math. J., Tome 5 (1994) no. 2, pp. 69-99. http://gdmltest.u-ga.fr/item/1273844778/