See data and maps.
Moroz, George (2021). “Nasalization”. In: Typological Atlas of the Languages of Daghestan (TALD), v 2.0.1. Ed. by George Moroz, Michael Daniel, Konstantin Filatov, Timur Maisak, Timofey Mukhin, Irina Politova, Elena Shvedova, Samira Verhees and Chiara Naccarato. Moscow: Linguistic Convergence Laboratory, HSE University. DOI: 10.5281/zenodo.6807070. https://lingconlab.ru/tald.
@incollection{moroz2021,
title = {Nasalization},
author = {George Moroz},
year = {2021},
editor = {George Moroz and Michael Daniel and Konstantin Filatov and Timur Maisak and Timofey Mukhin and Irina Politova and Elena Shvedova and Samira Verhees and Chiara Naccarato},
publisher = {Linguistic Convergence Laboratory, HSE University},
address = {Moscow},
booktitle = {Typological Atlas of the Languages of Daghestan (TALD), v 2.0.1},
url = {https://lingconlab.ru/tald},
doi = {10.5281/zenodo.6807070},
}General chapter: Phonology
Nasalized vowels are a common feature of Andic and Tsezic languages, however some researchers report a sporadic final n-delition that leads to the development of nasalized vowels in other branches (e.g. Bezhta, (Comrie et al. 2015)).