no. 1
Coherent and quasi-free states
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 31 (1979) no. 1, pp. 1-4 
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     author = {Demoen, Bart},
     title = {Coherent and quasi-free states},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {1--4},
     year = {1979},
     publisher = {Gauthier-Villars},
     volume = {31},
     number = {1},
     mrnumber = {557048},
     zbl = {0434.46043},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1979__31_1_1_0/}
}
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Demoen, Bart. Coherent and quasi-free states. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 31 (1979) no. 1, pp. 1-4. https://www.numdam.org/item/AIHPA_1979__31_1_1_0/

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