Harrison (Kenneth Pritchard)

Harrison (Kenneth): Epacts in Irish chronicles.
In StC 12–13 (1977–1978), pp. 17–32.
Particularly in the Annals of Ulster and the Annals of Inisfallen.
Harrison (Kenneth): Episodes in the history of Easter cycles in Ireland.
Harrison (Kenneth): A letter from Rome to the Irish clergy, AD 640.
In Peritia 3 (1984), pp. 222–229.
Discusses a letter quoted by Bede and the calculation of Easter.