Wataru Hashimoto Tetsuya Nakamura Sadaaki Miyamoto Comparison and Evaluation of Different Cluster Validity Measures Including Their Kernelization. 204-209 2009 13 JACIII 3 http://www.fujipress.jp/finder/xslt.php?mode=present&inputfile=JACII001300030005.xml db/journals/jaciii/jaciii13.html#HashimotoNM09