Periodic Schrödinger Operators with Constant Weak Magnetic Fields
Les rencontres physiciens-mathématiciens de Strasbourg -RCP25, Conférences de B. Helffer, J. Sjöstrand, D. Ruelle et J. Fritz, Tome 40 (1989), Exposé no. 2, 8 p. 
@article{RCP25_1989__40__19_0,
     author = {Helffer, B. and Sj\"ostrand, J.},
     title = {Periodic {Schr\"odinger} {Operators} with {Constant} {Weak} {Magnetic} {Fields}},
     journal = {Les rencontres physiciens-math\'ematiciens de Strasbourg -RCP25},
     note = {talk:2},
     pages = {19--26},
     publisher = {Institut de Recherche Math\'ematique Avanc\'ee - Universit\'e Louis Pasteur},
     volume = {40},
     year = {1989},
     language = {en},
     url = {http://archive.numdam.org/item/RCP25_1989__40__19_0/}
}
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Helffer, B.; Sjöstrand, J. Periodic Schrödinger Operators with Constant Weak Magnetic Fields. Les rencontres physiciens-mathématiciens de Strasbourg -RCP25, Conférences de B. Helffer, J. Sjöstrand, D. Ruelle et J. Fritz, Tome 40 (1989), Exposé no. 2, 8 p. http://archive.numdam.org/item/RCP25_1989__40__19_0/

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