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Conference Proceedings
Towards a unified framework for geographical data models
Camara Neto, G. & Monteiro, A. M. V. & Paiva, J. A. & Gomes, J. & Velho, L. :2000:
<sid.inpe.br/iris@1912/2005/07.21.01.23>
<mtc-m12.sid.inpe.br:80>