By Campos J.   Hornsby K.   Egenhofer M.J.   in Journal of Visual Languages & Computing

ISSN:1045-926X|14|5|471-494

Elsevier‎(2003)‎

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By Nedas K. A.   Egenhofer M. J.   Wilmsen D.   in International Journal of Geographical Information Science

ISSN:1365-8824|21|1|21-48

Taylor & Francis Ltd‎(2007)‎

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