Semiclassical expansions of the thermodynamic limit for a Schrödinger equation
Méthodes semi-classiques Volume 2 - Colloque international (Nantes, juin 1991), Astérisque, no. 210 (1992), pp. 135-181. 
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     author = {Helffer, B. and Sj\"ostrand, J.},
     title = {Semiclassical expansions of the thermodynamic limit for a {Schr\"odinger} equation},
     booktitle = {M\'ethodes semi-classiques Volume 2 - Colloque international (Nantes, juin 1991)},
     series = {Ast\'erisque},
     pages = {135--181},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {210},
     year = {1992},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1992__210__135_0/}
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Helffer, B.; Sjöstrand, J. Semiclassical expansions of the thermodynamic limit for a Schrödinger equation, dans Méthodes semi-classiques Volume 2 - Colloque international (Nantes, juin 1991), Astérisque, no. 210 (1992), pp. 135-181. http://archive.numdam.org/item/AST_1992__210__135_0/

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