Yukio Sadahiro Stability of the surface generated from distributed points of uncertain location. 139-156 2003 17 International Journal of Geographical Information Science 2 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1365-8816&volume=17&issue=2&spage=139 db/journals/gis/gis17.html#Sadahiro03