@article{AIHPA_1989__51_4_419_0,
     author = {Figliolini, Franca and Guido, Daniele},
     title = {The {Tomita} operator for the free scalar field},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {419--435},
     publisher = {Gauthier-Villars},
     volume = {51},
     number = {4},
     year = {1989},
     mrnumber = {1034596},
     zbl = {0715.46049},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1989__51_4_419_0/}
}