TY - JOUR AU - Grigorios Tsagas TI - The Closed Geodesics of a Special Manifold. JO - Mathematische Annalen PY - 1972 SP - 155 EP - 160 VL - 199 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MAN_1972__199_162321/ ID - MAN_1972__199_162321 ER -