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This research was supported in part by NSF Grant #MCS 80-02955
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Garnett, J., Trubowitz, E. Gaps and bands of one dimensional periodic Schrödinger operators. Commentarii Mathematici Helvetici 59, 258–312 (1984). https://doi.org/10.1007/BF02566350
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DOI: https://doi.org/10.1007/BF02566350