@article{GDZPPN002065088,
title = {Some existence theorems for closed geodesics.},
journal = {Commentarii mathematici Helvetici},
volume = {58},
year = {1983},
pages = {416-432},
zbl = {0532.53034},
url = {http://dml.mathdoc.fr/item/GDZPPN002065088}
}
Ballmann, W.; Thorbergsson, G. Some existence theorems for closed geodesics.. Commentarii mathematici Helvetici, Tome 58 (1983) pp. 416-432. http://gdmltest.u-ga.fr/item/GDZPPN002065088/