9Estivill- Casrrov, LEE I J. AUTOCLUST: Automatic cluster-ing via boundary extraction for mining massive point_ data sets [C] //Proceeding of International conference on Geo_ compuation,2000. Greenwich; University of Greenwich, 2000:23 -25.
10Tsai V J D. Delatmay Triangulations in TIN Crea:ion: an Overview and a Linear- time Algorithm[J ]. lnt . J. of GIS. 1993,7(6) :501 - 524.