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        Leonardo da Pisa, Liber abaci, Ms. Biblioteca Nazionale di Firenze, Codice magliabechiano cs cI, 2626, fol. 124r Source: Heinz Lüneburg, Leonardi Pisani Liber Abaci oder Lesevergnügen eines Mathematikers, 2. überarb. und erw. Ausg., Mannheim et al.: BI Wissenschaftsverlag, 1993
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