@article{01711104,
title = {Classical integrable mechanical systems and their integrable perturbations.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {64(78)},
year = {1998},
pages = {153-164},
zbl = {0999.37038},
language = {en},
url = {http://dml.mathdoc.fr/item/01711104}
}
Dragović, Vladimir. Classical integrable mechanical systems and their integrable perturbations.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 64(78) (1998) pp. 153-164. http://gdmltest.u-ga.fr/item/01711104/