1. The Open Source Initiative, 2014, The Open Source Definition Version 1.9, webpage at http://opensource.org/osd.
2. Free Software Foundation, 2014, GNU GENERAL PUBLIC LICENSE, webpage at http://www.gnu.org/licenses/gpl.html.
3. Analysis and evaluation of open source project evolution based on the automatic classification of SCM data;Tai;IEICE Technical Report. Software Science,2011
4. A Method for Activity Prediction using Cluster Analysis on Email Threads;Ohkura;IEICE Technical Report. Software Science,2007
5. A Method of Reliability Assessment for Open Source System Development Based on Genetic Algorithms;Tamura;IEICE Technical Report Software Science,2006