no. 2
Normal states and representations of the canonical commutation relations
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 14 (1971) no. 2, pp. 171-178 
@article{AIHPA_1971__14_2_171_0,
     author = {Courbage, M. and Miracle-Sole, S. and Robinson, Derek W.},
     title = {Normal states and representations of the canonical commutation relations},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {171--178},
     year = {1971},
     publisher = {Gauthier-Villars},
     volume = {14},
     number = {2},
     mrnumber = {277204},
     zbl = {0225.46060},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1971__14_2_171_0/}
}
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Courbage, M.; Miracle-Sole, S.; Robinson, Derek W. Normal states and representations of the canonical commutation relations. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 14 (1971) no. 2, pp. 171-178. https://www.numdam.org/item/AIHPA_1971__14_2_171_0/

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