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DJVU PDF Jenner, P. 1976, "The value of i, ī, u and ū in Middle Khmer", in The Mon-Khmer Studies Journal, vol. 5, pp. 101-133. cite.
DJVU PDF Phillips, R., Phillips, J. and Miller, C. 1976, "The Brũ vowel system: alternate analyses", in The Mon-Khmer Studies Journal, vol. 5, pp. 203-217. cite.