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@article{CMH_1984__59_139977, author = {J. Garnett and Eugene Trubowitz}, title = {Gaps and bands of one dimensional periodic {Schr\"odinger} operators.}, journal = {Commentarii mathematici Helvetici}, pages = {258--312}, publisher = {mathdoc}, volume = {59}, year = {1984}, zbl = {0554.34013}, url = {http://geodesic.mathdoc.fr/item/CMH_1984__59_139977/} }
J. Garnett; Eugene Trubowitz. Gaps and bands of one dimensional periodic Schrödinger operators.. Commentarii mathematici Helvetici, Tome 59 (1984), pp. 258-312. http://geodesic.mathdoc.fr/item/CMH_1984__59_139977/