@article{AIHPA_1992__57_2_147_0,
     author = {Marmo, G. and Mendella, G. and Tulczyjew, W. M.},
     title = {Symmetries and constants of the motion for dynamics in implicit form},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {147--166},
     publisher = {Gauthier-Villars},
     volume = {57},
     number = {2},
     year = {1992},
     mrnumber = {1184887},
     zbl = {0766.58020},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1992__57_2_147_0/}
}