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Halter-Koch, F. Einige periodische Kettenbruchentwicklungen und Grundeinheiten quadratischer Ordnungen. Abh.Math.Semin.Univ.Hambg. 59, 157–169 (1989). https://doi.org/10.1007/BF02942326
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DOI: https://doi.org/10.1007/BF02942326