@article{AIHPA_1980__32_4_303_0,
     author = {Llosa, J. A. and Marqu\'es, F. and Molina, A.},
     title = {Predictive extension of a singular lagrangian system},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {303--318},
     publisher = {Gauthier-Villars},
     volume = {32},
     number = {4},
     year = {1980},
     mrnumber = {594630},
     zbl = {0452.35105},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1980__32_4_303_0/}
}