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Irish cultural influence in Europe, 6th to 12th century, Dublin, 1967.
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Gaelscrínte san Eoraop. Dublin, 1986.
Irish monks in Germany in the late Middle Ages, in The Church, Ireland and the Irish, (ed. W.J. Sheils and Diana Wood), Oxford, 1989; studies in Church history, xxv, pp.89–104.
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