Masao Ohira Tetsuya Ohoka Takeshi Kakimoto Naoki Ohsugi Ken-ichi Matsumoto Supporting Knowledge Collaboration Using Social Networks in a Large-Scale Online Community of Software Development Projects. 835-840 2005 conf/apsec/2005 APSEC http://doi.ieeecomputersociety.org/10.1109/APSEC.2005.99 db/conf/apsec/apsec2005.html#OhiraOKOM05