Hang Li Ting Liu Wei-Ying Ma Tetsuya Sakai Kam-Fai Wong Guodong Zhou Information Retrieval Technology, 4th Asia Infomation Retrieval Symposium, AIRS 2008, Harbin, China, January 15-18, 2008, Revised Selected Papers 4993 2008 978-3-540-68633-0 Lecture Notes in Computer Science Springer AIRS db/conf/airs/airs2008.html