Information Retrieval Technology 9th Asia Information Retrieval Societies Conference, AIRS 2013, Singapore, December 9-11, 2013, Proceedings - Banchs, Rafael.; Banchs, Rafael.; Silvestri, Fabrizio.; Silvestri, Fabrizio.; Liu, Tie-Yan.; Liu, Tie-Yan.; Zhang, Min.; Zhang, Min.; Gao, Sheng.; Gao, Sheng.; Lang, Jun.; Lang, Jun. (Springer Berlin Heidelberg : Imprint: Springer, 2013)