http://www.husdal.com/gisruk2002/Sherlock_Mooney_Winstanley_Husdal_NUI_Maynooth.pdf
http://www.kanotech.com/solutions/utilities/
http://publish.uwo.ca/~jmalczew/gida_1/Zhan/Zhan.htm
http://www.hunter-gis.com/ws_solutions/TK_Short/TK_Short.htm
http://www.hunter-gis.com/ws_solutions/TK_Short/TK_Short.htm
http://gis.esri.com/library/userconf/proc03/p0320.pdf
http://www.hsor.org/downloads/Speedy_Delivery_teacher.pdf
http://www.husdal.com/gis/print/research.htm


http://www-b2.is.tokushima-u.ac.jp/~ikeda/suuri/dijkstra/DijkstraApp.shtml?demo10
http://carbon.cudenver.edu/~hgreenbe/sessions/dijkstra/DijkstraApplet.html