Chenyu Li Kunqing Xie Xiujun Ma Cuo Cai Yanfeng Sun A Distributed Cooperative Technology for Spatial Grid Computing. 889-897 2007 6 Data Sci. J. http://www.jstage.jst.go.jp/article/dsj/6/0/6_S889/_article db/journals/datascience/datascience6.html#LiXMCS07