DJVU PDF Benedict, P.K. 1981, "Vietnamese /s/ and /x/: the chu nom evidence", in Linguistics of the Tibeto-Burman Area, vol. 6, no. 2, pp. 105-106. cite.
DJVU PDF Tran trong, H. 1975, "Verb concatenation in Vietnamese", in Linguistics of the Tibeto-Burman Area, vol. 2, no. 2, pp. 243-272. cite.