Youhei Timura Katsuya Tanaka Makoto Takizawa Group Protocol for Distributed Object-Based Systems. 729-743 2002 18 J. Inf. Sci. Eng. 5 http://www.iis.sinica.edu.tw/page/jise/2002/200209_05.html db/journals/jise/jise18.html#TimuraTT02