@article{TAM_2017_44_2_a4,
     author = {Alexander V. Karapetyan and Alexander S. Kuleshov},
     title = {The {Routh} theorem for mechanical systems with unknown first integrals},
     journal = {Theoretical and applied mechanics},
     pages = {169 - 180},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {2017},
     url = {http://geodesic.mathdoc.fr/item/TAM_2017_44_2_a4/}
}