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DJVU PDF Haller, F. 2000, "The Verbal categories of Shigatse Tibetan and Themchen Tibetan", in Linguistics of the Tibeto-Burman Area, vol. 23, no. 2, pp. 175-191. cite.

DJVU PDF Haller, F. 1999, "A brief comparison of register tone in Central Tibetan and Kham Tibetan", in Linguistics of the Tibeto-Burman Area, vol. 22, no. 2, pp. 77-97. cite.