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Additional information
M. V. Lomonosov Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 23, No. 2, pp. 55–56, April–June, 1989.
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Gusein-Zade, S.M. Number of critical points for a quasiperiodic potential. Funct Anal Its Appl 23, 129–130 (1989). https://doi.org/10.1007/BF01078782
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DOI: https://doi.org/10.1007/BF01078782