@article{AIHPA_1981__35_1_55_0,
     author = {Castagnino, Mario},
     title = {The quantum equivalence principle, and spin 1/2 massive particles},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {55--95},
     publisher = {Gauthier-Villars},
     volume = {35},
     number = {1},
     year = {1981},
     mrnumber = {626557},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1981__35_1_55_0/}
}