Hill, N.W. 2006, "Tibetan /vwa/ 'fox' and the Sound Change Tibeto-Burman *wa > Tibetan o [CHECK]", in Linguistics of the Tibeto-Burman Area, vol. 29, no. 2, pp. 75-90. cite.

Hajek, J. 2006, "On doubly articulated labial-velar stops and nasals in Tibeto-Burman", in Linguistics of the Tibeto-Burman Area, vol. 29, no. 2, pp. 123-132. cite.