@article{AIHPA_1972__16_4_235_0,
     author = {Ghez, P.},
     title = {Spectre du hamiltonien et \'equivalence alg\'ebrique des \'etats quasi-libres du champ de fermions},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {235--246},
     publisher = {Gauthier-Villars},
     volume = {16},
     number = {4},
     year = {1972},
     mrnumber = {334744},
     language = {fr},
     url = {http://archive.numdam.org/item/AIHPA_1972__16_4_235_0/}
}