Wenzhong Shi Matthew Yick Cheung Pang Development of Voronoi-based cellular automata -an integrated dynamic model for Geographical Information Systems. 455-474 2000 14 International Journal of Geographical Information Science 5 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1365-8816&volume=14&issue=5&spage=455 db/journals/gis/gis14.html#ShiP00