@article{AIHPA_1967__7_4_319_0,
     author = {Droz-Vincent, Philippe H.},
     title = {Poisson brackets of the constraints in unified field theory},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {319--331},
     publisher = {Gauthier-Villars},
     volume = {7},
     number = {4},
     year = {1967},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1967__7_4_319_0/}
}