@article{SIGMA_2007_3_a50,
     author = {Francesco Fass\`o and Andrea Giacobbe},
     title = {Geometry of {Invariant} {Tori} of {Certain} {Integrable} {Systems} with {Symmetry} and an {Application} to {a~Nonholonomic}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2007},
     volume = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a50/}
}