@article{SIGMA_2013_9_a3,
     author = {Sara Cruz y Cruz and Oscar Rosas-Ortiz},
     title = {Dynamical {Equations,} {Invariants} and {Spectrum} {Generating} {Algebras} of {Mechanical}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2013},
     volume = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2013_9_a3/}
}