Takeshi Shirabe Towards a Temporal Extension of Spatial Allocation Modeling. 285-298 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3234&spage=285 2004 conf/giscience/2004 GIScience db/conf/giscience/giscience2004.html#Shirabe04