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Djakov, P., Mityagin, B. The Asymptotics of Spectral Gaps of a 1D Dirac Operator with Cosine Potential. Letters in Mathematical Physics 65, 95–108 (2003). https://doi.org/10.1023/B:MATH.0000004362.01299.c7
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DOI: https://doi.org/10.1023/B:MATH.0000004362.01299.c7