Jun Shen Junzhou Luo Guanqun Gu An Object-Oriented Net Graph Model for Agent Group-Based Network Management. 126-132 1999 conf/tools/31-1999 TOOLS (31) http://doi.ieeecomputersociety.org/10.1109/TOOLS.1999.796475 db/conf/tools/tools31-1999.html#ShenLG99