@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/