In Gaelic, vowels can either be short or long. This distinction refers to the duration of the vowel. In Gaelic orthography, long vowels are is expressed using a grave accent on the vowel (à, è, ì, ò, ù).
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- Ladefoged, D. (2010) A Course in Phonetics. 6th Edition. Wadsworth Publishing.
- Lamb, William (2003) Scottish Gaelic. 2nd edition. Munich: Lingcom Europa