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Nicéphore Calliste Xanthopoulos (1256?-1335?) : Interpretatio Graduum Octoechorum (BHG 2382), Portal Biblissima. Permalink: https://biblissima.demo.logilab.fr/ark:/43093/oedataca06ae5b8a00b16e9f9cfe6cc493d47a3ac21d52 (seen 17/10/2026)
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