P. Li, J. Nie, B. Wang, und J. He. Web Intelligence and Intelligent Agent Technology (WI-IAT), 2012 IEEE/WIC/ACM International Conferences on, 1, Seite 274-281. (Dezember 2012)
T. Sakai, und C. Lin. the 3rd International Workshop on Evaluating Information Access (EVIA) --- A Satellite Workshop of NTCIR-8, Seite 25--33. Tokyo, Japan, National Institute of Informatics, (Juni 2010)