@article{SIGMA_2015_11_a84,
     author = {Andrey V. Tsiganov},
     title = {On {Integrable} {Perturbations} of {Some} {Nonholonomic} {Systems}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2015},
     volume = {11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2015_11_a84/}
}