4S.M Witt,Use of Speech Recognition in Computer-assisted Language Learning,Doctor's Dissertation of Cambridge[D].November 1999.
5YUE Dongjian,CHAI Peiqi,The Features of Chinese Computer-Aided Language Learning System[A].In:ISCSLP[C].2000.117-121.
6C.H.JO,Studies on Computer-Assisted Pronunciation Learning System for Non-native Learners based on Speech Recognition Techniques,PhDs thesis[D].January 1999.
7H.Franco,L.Neumeyer,Y.Kim and O.Ronen,Automatic Pronunciation Scoring for Language Instruction[A].In..ICASSP[C].1997.1471-1474.
8L.Neumeyer,H.Franco,M.Weintraub and P.Price,Automatic Text-independent Pronunciation Scoring of Foreign Language Student Speech[A].In:ICSLP[C].1996.1457-1460.
9S.M.Witt,S.J.Young,Phone-level Pronunciation Scoring and Assessment for Interactive Language Learning[A].In:Speech Communication 30[C].2000.95-108.