@article{AIHPA_1986__45_3_311_0,
     author = {Gudder, Stanley},
     title = {Partial {Hilbert} spaces and amplitude functions},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {311--326},
     publisher = {Gauthier-Villars},
     volume = {45},
     number = {3},
     year = {1986},
     mrnumber = {868529},
     zbl = {0659.46025},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1986__45_3_311_0/}
}