no. 3
On the existence of a class of stationary quantum stochastic processes
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 22 (1975) no. 3, pp. 241-248. 
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     author = {Lewis, J. T. and Thomas, L. C.},
     title = {On the existence of a class of stationary quantum stochastic processes},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {241--248},
     publisher = {Gauthier-Villars},
     volume = {22},
     number = {3},
     year = {1975},
     mrnumber = {432083},
     zbl = {0307.60033},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1975__22_3_241_0/}
}
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Lewis, J. T.; Thomas, L. C. On the existence of a class of stationary quantum stochastic processes. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 22 (1975) no. 3, pp. 241-248. http://archive.numdam.org/item/AIHPA_1975__22_3_241_0/

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