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The work of the first author was supported in part by the NSF Grant No. DMS 8903076 and the second by NSF Grant No. DMS 84-5179 (1989).
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Phillips, R., Sarnak, P. The spectrum of fermat curves. Geometric and Functional Analysis 1, 80–146 (1991). https://doi.org/10.1007/BF01895418
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DOI: https://doi.org/10.1007/BF01895418