Feuth (Els)

Feuth (Els): Two segments or one?: nasalized voiced plosives in Old Irish.
In ZCP 39 (1982), pp. 88–95.
Argues that the nasals in three-consonant clusters or resulting from nasalization do not coalesce with a following b, d, g, and that the punctum delens is an orthographical device used regularly to denote these real clusters.
Feuth (Els): Gemination: an Old Irish mutation rule?
In Ériu 34 (1983), pp. 143–156.
Appendix: An inventory of word-initial gemination including nasalization by means of gemination in Würzburg, Milan and St Gall.