C. Lu, X. Chen, and E. Park. Proceeding of the 18th ACM conference on Information and knowledge management, page 1545--1548. New York, NY, USA, ACM, (2009)
C. Lu, X. Chen, and E. Park. CIKM '09: Proceeding of the 18th ACM conference on Information and knowledge management, page 1545--1548. New York, NY, USA, ACM, (2009)