@article{RCP25_1989__40__19_0, author = {Helffer, Bernard and Sj\"ostrand, Johannes}, title = {Periodic Schr\"odinger Operators with Constant Weak Magnetic Fields}, journal = {Les rencontres physiciens-math\'ematiciens de Strasbourg -RCP25}, volume = {40}, year = {1989}, pages = {19-26}, language = {en}, url = {http://dml.mathdoc.fr/item/RCP25_1989__40__19_0} }
Helffer, B.; Sjöstrand, J. Periodic Schrödinger Operators with Constant Weak Magnetic Fields. Les rencontres physiciens-mathématiciens de Strasbourg -RCP25, Tome 40 (1989) pp. 19-26. http://gdmltest.u-ga.fr/item/RCP25_1989__40__19_0/
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