@article{RSMUP_2008__120__1_0,
     author = {Mu\~noz Masqu\'e, Jaime and Rosado Mar{\'\i}a, M. Eugenia},
     title = {The {Problem} of {Invariance} for {Covariant} hamiltonians},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--28},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {120},
     year = {2008},
     mrnumber = {2492647},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2008__120__1_0/}
}