Warntjes, Immo, “The Computus Cottonianus of AD 689: a computistical formulary written for Willibrord’s Frisian mission”, in: Immo Warntjes, and Dáibhí Ó Cróinín (eds), The Easter controversy of Late Antiquity and the early Middle Ages: its manuscripts, texts, and tables. Proceedings of the 2nd International Conference on the Science of Computus in Ireland and Europe, Galway, 18–20 July, 2008, 10, Turnhout: Brepols, 2011. 173–212.
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