Suzuki, Hiroyuki; Wangmo, Sonam. An outline of the sound structure of Lhagang Choyu: A newly recognised highly endangered language in Khams Minyag. 2019.
'Complex vowels' are /ie iɛ io ue uɛ ua uə ye yə/ in addition to /ei/. Prenasalized and preaspirated consonants are said to exist, in addition to a wide variety of initial clusters, but are not listed.