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Críostóir Mac Cárthaigh, The Ship-Sinking Witch. A Maritime Folk Legend from North-West Europe, Béaloideas, Iml. 60/61, Finscealta Agus Litriocht: Paipeir a cuireadh I lathair ag an Siompoisiam Nordach-Ceiltech / Legends and Fiction: Papers Presented at the Nordic-Celtic Legend Symposium (1992/1993), pp. 267-286
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Críostóir Mac Cárthaigh (1992) studied this question.
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