Hongxun Yao Wen Gao Wei Shan Ming-hui Xu Visual Features Extracting & Selecting for Lipreading. 251-259 http://dx.doi.org/10.1007/3-540-44887-X_30 2003 conf/avbpa/2003 AVBPA db/conf/avbpa/avbpa2003.html#YaoGSX03