Tomotake Nakamura Yoko Kamidoi Shin'ichi Wakabayashi Noriyoshi Yoshida A Clustering Method Using an Irregular Size Cell Graph. 19-26 2005 conf/ride/2005 RIDE http://doi.ieeecomputersociety.org/10.1109/RIDE.2005.5 db/conf/ride/ride2005.html#NakamuraKWY05