TY  - JOUR
AU  - Werner Ballmann
TI  - On the Lengths of Closed Geodesics on Convex Surfaces.
JO  - Inventiones mathematicae
PY  - 1983
SP  - 593
EP  - 598
VL  - 71
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1983__71_143006/
ID  - IM_1983__71_143006
ER  -