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@article{AIHPA_1973__18_1_57_0, author = {Bel, Luis}, title = {Hamiltonian {Poincar\'e} invariant systems}, journal = {Annales de l'I.H.P. Physique th\'eorique}, pages = {57--75}, publisher = {Gauthier-Villars}, volume = {18}, number = {1}, year = {1973}, mrnumber = {334814}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AIHPA_1973__18_1_57_0/} }
Bel, Luis. Hamiltonian Poincaré invariant systems. Annales de l'I.H.P. Physique théorique, Tome 18 (1973) no. 1, pp. 57-75. http://geodesic.mathdoc.fr/item/AIHPA_1973__18_1_57_0/