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Riedemann, Catharina (2004). "Towards Usable Topological Operators at GIS User Interfaces"(PDF). In Toppen, F.; P. Prastacos (eds.). Proceedings 2004: The 7th AGILE Conference on Geographic Information Science. pp. 669–674. Archived from the original(PDF) on 2017-01-13. Retrieved 2017-01-11.