1. Baumgart B. A polyhedron representation for computer vision. In: National Computer Conference; 1975, p. 589–96.
2. Census Bureau. The DIME Geocoding System. Report No. 4, Census Use Study, US Department of Commerce, Bureau of the Census. 1970.
3. Cooke D. and Maxfield W. The development of a geographic base file and its uses for mapping. In: Proceedings of the 5th Annual Conference on Urban and Regional Information System Association; 1967. p. 207–18.
4. Corbett J. Topological principles in cartography. Technical Paper 48. Washington: Bureau of the Census; 1979.
5. Egenhofer M, Clementini E, Di Felice P. Topological relations between regions with holes. Int J Geograph Inform Syst. 1994;8(2):129–42.