国際会議: [1] Masao Ohira, Kiwako Koyama, Akinori Ihara, Shinsuke Matsumoto, Yasutaka Kamei, and Ken-ichi Matsumoto, "A Time-Lag Analysis Toward Improving the Efficiency of Communications among Oss Developers," In Proceedings of The 3rd International Workshop on Knowledge Collaboration in Software Development (KCSD2009), pages 49--62, November 2009.