Zhiqiang Ma Anthony Watson Wanwu Guo Application of MCDF Operations in Digital Terrain Model Processing. 471-478 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3046&spage=471 2004 conf/iccsa/2004-4 ICCSA (4) db/conf/iccsa/iccsa2004-4.html#MaWG04