Tomoyuki Ohta Shinji Inoue Yoshiaki Kakuda Kenji Ishida Kaori Maeda An Adaptive Maintenance of Hierarchical Structure in Ad Hoc Networks and Its Evaluation. 7-13 2002 conf/icdcsw/2002 ICDCS Workshops http://doi.ieeecomputersociety.org/10.1109/ICDCSW.2002.1030741 db/conf/icdcsw/icdcsw2002.html#OhtaIKIM02