DJVU PDF Handel, Z. 2002, "Proto-Lolo-Burmese velar clusters and the origin of Lisu palatal sibilants", in Linguistics of the Tibeto-Burman Area, vol. 25, no. 1, pp. 95-112. cite.

DJVU PDF Matisoff, J.A. 2002, "Wedge issues", in Linguistics of the Tibeto-Burman Area, vol. 25, no. 1, pp. 137-164. cite.