Makoto Ichii Makoto Matsushita Katsuro Inoue An Exploration of Power-Law in Use-Relation of Java Software Systems. 422-431 2008 Australian Software Engineering Conference http://doi.ieeecomputersociety.org/10.1109/ASWEC.2008.60 conf/aswec/2008 db/conf/aswec/aswec2008.html#IchiiMI08