1. The National Science Foundation National Center for Geographic Information and Analysis;Abler;International Journal of Geographical Information Systems,1987
2. Elements of spatial structure: A quantitative approach;Cliff,1975
3. Spatial processes: Models and applications;Cliff,1981
4. Spatial decision support systems: A research agenda;Densham;GIS/LIS '89 Proceedings,1989
5. ARCIMFO user guide, vol. 1: Geographic information system software;Environmental Systems Research Institute,1987