Persohn B. 2019. /mu/ and mu-reduction in Nyakyusa. South African Journal of African Languages 39(2): 191–203. https://doi.org/10.1080/02572117.2019.1618023
On page 202, note 2 should read as follows:
The long vowel sequences /(a)mʊʊ, ɲɪɪ, ɲʊʊ, anɪɪ, amɪɪ/ are attested as the outcome of contact between prefixes and stem-initial vowels.