Lei Zhang Xiang-Wu Meng Jun-Liang Chen Si-Cheng Xiong Kun Duan Alleviating Cold-Start Problem by Using Implicit Feedback. 763-771 2009 ADMA http://dx.doi.org/10.1007/978-3-642-03348-3_81 conf/adma/2009 db/conf/adma/adma2009.html#ZhangMCXD09