Geodesic
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 
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://geodesic.mathdoc.fr/item/AST_1992__210__135_0/
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     title = {Semiclassical expansions of the thermodynamic limit for a {Schr\"odinger} equation},
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