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.

DJVU PDF Hill, N.W. 2005, "Once more on the letter /v/ ,", in Linguistics of the Tibeto-Burman Area, vol. 28, no. 2, pp. 107-137. cite.