Junzo Kamahara Tomofumi Asakawa Shinji Shimojo Hideo Miyahara A Community-Based Recommendation System to Reveal Unexpected Interests. 433-438 2005 conf/mmm/2005 MMM http://doi.ieeecomputersociety.org/10.1109/MMMC.2005.5 db/conf/mmm/mmm2005.html#KamaharaASM05