@article{GDZPPN002306867, title = {The Closed Geodesics of a Special Manifold.}, journal = {Mathematische Annalen}, volume = {196}, year = {1972}, pages = {155-160}, zbl = {0285.53037}, url = {http://dml.mathdoc.fr/item/GDZPPN002306867} }
Tsagas, Grigorios. The Closed Geodesics of a Special Manifold.. Mathematische Annalen, Tome 196 (1972) pp. 155-160. http://gdmltest.u-ga.fr/item/GDZPPN002306867/