References
- Rees , G. and Rees , P. H. 1990 . A ward population information system for Swansea , School of Geography, University of Leeds . Paper available from second author
- Scholten , H. and Stillwell , J. C. , eds. 1990 . Geographical information systems for urban and regional planning , Dordrecht : Kluwer .
- Worral , L. , ed. 1990 . Geographical information systems , London : Belhaven .