Takao Ookubo Takahide Matsutsuka Yoshihide Nomura Hirotaka Hara Sanya Uehara Practical Experiences of Designing a Distributed Collaborative System. 21- 2000 conf/edoc/2000 EDOC http://computer.org/proceedings/edoc/0865/08650021abs.htm db/conf/edoc/edoc2000.html#OkuboMNHU00