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DJVU PDF Zhang, L. 1986, "The puzzle of da-drag in Tibetan", in Linguistics of the Tibeto-Burman Area, vol. 9, no. 1, pp. 47-64. cite.

DJVU PDF Denwood, P. 1986, "The Tibetan noun final -s", in Linguistics of the Tibeto-Burman Area, vol. 9, no. 1, pp. 97-101. cite.