Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

	1	Peter Baumann, Management of multidimensional discrete data, The VLDB Journal — The International Journal on Very Large Data Bases, v.3 n.4, October 1994
	2	Delis, V., Hadzilacos, T., and Tryfona, N. An Introduction to Layer Algebra. Tech. Rep. CTI-94.01.2, Computer Technology Institute, University of Patras, Greece, 1994.
	3	Draft Base Document-OGIS Project Document 94-025R1. The Open Geodata Interoperability Specification, October 1994.
	4	Gerlough, D.L., and Huber, M.J. Traffic Flow Theory: A Monograph. Special Report 165. Transportation Research Board National Research Council, Washington D.C., 1974.
	5	Gunther, O., and Riekert, W. The design of GODOT: An object-oriented geographical information system. IEEE Data Engineering Bulletin 16, 3 (1993).
	6	Ralf Hartmut Güting, An introduction to spatial database systems, The VLDB Journal — The International Journal on Very Large Data Bases, v.3 n.4, October 1994
	7	Ralf Hartmut Güting, GraphDB: Modeling and Querying Graphs in Databases, Proceedings of the 20th International Conference on Very Large Data Bases, p.297-308, September 12-15, 1994
	8	Kosters, G., Pagel, B.U., and Six, H.W. Object-oriented requirements engineering for GIS applications. In Proceedings of the ACM International Conj~rence on Geographical Information Systems (1995).
	9	Shamkant B. Navathe, Evolution of data modeling for databases, Communications of the ACM, v.35 n.9, p.112-123, Sept. 1992  [doi>10.1145/130994.131001]
	10	G.-C. Roman, Formal Specification of Geographic Data Processing Requirements, IEEE Transactions on Knowledge and Data Engineering, v.2 n.4, p.370-380, December 1990  [doi>10.1109/69.63249 ]
	11	Tryfona, N., and Hadzilacos, T. Geographic applications development: Models and tools for the conceptual level. In Proceedings of the ACM International Conj~rence on Geographical Information System (1995).
	12	Worboy, M.F. Object-oriented approaches to geo-referenced information. Int. J. Geographical Info. Syst. 8, 4 (1994).

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