Kouji Nishimura Akio Seki Hajime Masaoka Tohru Kondo Koichi Tashima Seigo Kishiba Reiji Aibara Realizing Policy Roaming by Cooperating Edge-Mobility and Authentication Systems. 285-288 2008 SAINT http://doi.ieeecomputersociety.org/10.1109/SAINT.2008.62 conf/saint/2008 db/conf/saint/saint2008.html#NishimuraSMKTKA08