Mathematics at Charlemagne's court and its transmission
Turnhout / Brepols (2003) [Contribution to a book, Contribution to a conference proceedings]
Court culture in the early Middle Ages : the proceedings of the first Alcuin Conference / ed. by Catherine Cubitt. Conference on 'Alcuin and Court Culture' ; 1 (York) : 1998.07.
Butzer, Paul L.
Butzer, K. W.
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