@article{PIM_1998_N_S_64_78_a12,
     author = {Vladimir Dragovi\'c},
     title = {Classical {Integrable} {Mechanical} {Systems} and {Their} {Integrable} {Perturbations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {153 },
     publisher = {mathdoc},
     volume = {_N_S_64},
     number = {78},
     year = {1998},
     zbl = {0999.37038},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1998_N_S_64_78_a12/}
}