By Gregory Ian   Ell Paul   in International Journal of Geographical Information Science

ISSN:1365-8824|20|2|135-152

Taylor & Francis Ltd‎(2006)‎

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By Hughes Lorna M.   Ell Paul S.   in International Journal of Humanities and Arts Computing

ISSN:1755-1706|3|1-2|193-201

Edinburgh University Press‎(2009)‎

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