@article{GDZPPN002419785,
title = {The Critical Points Theory for the Closed Geodesics Problem.},
journal = {Mathematische Zeitschrift},
volume = {154},
year = {1977},
pages = {231-246},
zbl = {0344.58013},
url = {http://dml.mathdoc.fr/item/GDZPPN002419785}
}
Mercuri, Francesco. The Critical Points Theory for the Closed Geodesics Problem.. Mathematische Zeitschrift, Tome 154 (1977) pp. 231-246. http://gdmltest.u-ga.fr/item/GDZPPN002419785/