Shuhua Lai Fenghua Zhu Yongqiang Sun A Design of Parallel R-tree on Cluster of Workstations. 119-133 http://link.springer.de/link/service/series/0558/bibs/1966/19660119.htm 2000 conf/dnis/2000 DNIS db/conf/dnis/dnis2000.html#LaiZS00