@article{GDZPPN002319373,
title = {Closed Geodesics on Complete Surfaces.},
journal = {Mathematische Annalen},
volume = {250},
year = {1980},
pages = {83-96},
zbl = {0422.53024},
url = {http://dml.mathdoc.fr/item/GDZPPN002319373}
}
Bangert, Victor. Closed Geodesics on Complete Surfaces.. Mathematische Annalen, Tome 250 (1980) pp. 83-96. http://gdmltest.u-ga.fr/item/GDZPPN002319373/