No TL;DR found
1251. Adelaar, Willem f. H. GRAMMATICAL VOWEL LENGTH AND THE CLASSIFICATION Of QUECHUA DIALECTS. International Journal of American Linguistics. 1984,50(1): 25-47. Some Quechua dialects have long vowels; others do not. Why this is the case must still be answered. The author interprets long vowels in Quechua I as the result of innovations, while other dialects support the view that vowel length may have been phonemic in Proto Quechua.