Visarut Ahkuputra Ekkarit Maneenoi Sudaporn Luksaneeyanawin Somchai Jitapunkul Acoustic Modelling of Vowel Articulation on the Nine Thai Spreading Vowels. 171-195 2003 16 Int. J. Comput. Proc. Oriental Lang. 3 http://dx.doi.org/10.1142/S0219427903000851 db/journals/ijcpol/ijcpol16.html#AhkuputraMLJ03