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@article{MAN_1972__199_162321, author = {Grigorios Tsagas}, title = {The {Closed} {Geodesics} of a {Special} {Manifold.}}, journal = {Mathematische Annalen}, pages = {155--160}, publisher = {mathdoc}, volume = {199}, year = {1972}, zbl = {0285.53037}, url = {http://geodesic.mathdoc.fr/item/MAN_1972__199_162321/} }
Grigorios Tsagas. The Closed Geodesics of a Special Manifold.. Mathematische Annalen, Tome 199 (1972), pp. 155-160. http://geodesic.mathdoc.fr/item/MAN_1972__199_162321/