McCone (Kim): Final /t/ to /d/ after unstressed vowels, and an Old Irish sound law.
In Ériu 32 (1981), pp. 29–44.
Establishes the following sound law for the beginning of the Old Irish period: ‘a voiceless dental stop or fricative on the word boundary was regularly voiced with an unstressed vowel, but otherwise remained unvoiced.' Includes discussion of -t and -d in 2 sg. prepositional pronouns.



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