Kojiro Taguchi Tomoya Enokido Makoto Takizawa Communication Protocol for a Hierarchical Group. 265-271 2003 conf/ftdcs/2003 FTDCS http://csdl.computer.org/comp/proceedings/ftdcs/2003/1910/00/19100265abs.htm db/conf/ftdcs/ftdcs2003.html#TaguchiET03