Chao-Lei Li Jia Liu Shanhong Xia Perceptual Evaluation of Pronunciation Quality for Computer Assisted Language Learning. 17-26 2006 conf/edutainment/2006 Edutainment http://dx.doi.org/10.1007/11736639_6 db/conf/edutainment/edutainment2006.html#LiLX06