@article{AIHPA_1984__40_3_225_0,
     author = {Baumg\"artel, Hellmut},
     title = {On the structure of relative identification operators for quantum fields and their connection with the {Haag-Ruelle} scattering theory},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {225--233},
     publisher = {Gauthier-Villars},
     volume = {40},
     number = {3},
     year = {1984},
     mrnumber = {770082},
     zbl = {0562.47010},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1984__40_3_225_0/}
}