%0 Journal Article %A Grigorios Tsagas %T The Closed Geodesics of a Special Manifold. %J Mathematische Annalen %D 1972 %P 155-160 %V 199 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1972__199_162321/ %F MAN_1972__199_162321