@book{MSMF_1989_2_39__1_0, author = {Helffer, Bernard and Sj\"ostrand, Johannes}, title = {Semi-classical analysis for Harper's equation. III : Cantor structure of the spectrum}, series = {M\'emoires de la Soci\'et\'e Math\'ematique de France}, publisher = {Soci\'et\'e math\'ematique de France}, number = {39}, year = {1989}, doi = {10.24033/msmf.346}, zbl = {0725.34099}, language = {en}, url = {http://archive.numdam.org/item/MSMF_1989_2_39__1_0/} }
Helffer, B.; Sjöstrand, J. Semi-classical analysis for Harper's equation. III : Cantor structure of the spectrum. Mémoires de la Société Mathématique de France, Série 2, , no. 39 (1989), 132 p. doi : 10.24033/msmf.346. http://numdam.org/item/MSMF_1989_2_39__1_0/
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