The entropy density of quasi-free states for a continuous boson system
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 28 (1978) no. 2, pp. 187-196. 
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     author = {Fannes, M.},
     title = {The entropy density of quasi-free states for a continuous boson system},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {187--196},
     publisher = {Gauthier-Villars},
     volume = {28},
     number = {2},
     year = {1978},
     mrnumber = {496234},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1978__28_2_187_0/}
}
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Fannes, M. The entropy density of quasi-free states for a continuous boson system. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 28 (1978) no. 2, pp. 187-196. http://archive.numdam.org/item/AIHPA_1978__28_2_187_0/

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