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This work was partially supported by the National Science Foundation Grant, MCS 77-01986.
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Moser, J. An example of a Schroedinger equation with almost periodic potential and nowhere dense spectrum. Commentarii Mathematici Helvetici 56, 198–224 (1981). https://doi.org/10.1007/BF02566210
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DOI: https://doi.org/10.1007/BF02566210