@article{AIHPA_1980__32_1_1_0,
     author = {Gotay, Mark J. and Nester, James M.},
     title = {Presymplectic lagrangian systems. {II} : the second-order equation problem},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {1--13},
     publisher = {Gauthier-Villars},
     volume = {32},
     number = {1},
     year = {1980},
     mrnumber = {574809},
     zbl = {0453.58016},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1980__32_1_1_0/}
}