Changping Zhang Yuji Murayama Testing local spatial autocorrelation using <i>k</i>-order neighbours. 681-692 2000 14 International Journal of Geographical Information Science 7 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1365-8816&volume=14&issue=7&spage=681 db/journals/gis/gis14.html#ZhangM00