1. The Dynamics of Global Urban Expansion;Angel;Transport and Urban Development Department, The World Bank,2005
2. Bobzien, M., Burghardt, D., Neun, M., & Weibel, R. (2006). Multi-Representation Databases With Explicitly Modelled Horizontal, Vertical and Update Relations. In AutoCarto, Vancouver-WA.
3. A review and conceptual framework of automated map generalization;Brassel;International Journal of Geographical Information Systems,1988
4. Bulger, D., & Hunt, H. (1991). The Plonski forest management decision support system project. In GIS ’91 Symposium Proceedings (Vol. 1, pp. 101–109).Vancouver: Forestry Canada.
5. Geographic objects with indeterminate boundaries;Burrough,1996