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Freitas, S., A. Paula Afonso, and M. J. Silva, "Mobile Geotumba: Geographic information retrieval system for mobile devices", Proc. of the 4th MiNEMA Workshop, Sintra, Portugal (July, 2-3 2006), pp. 83–87, 2006.
Carmo, M. Beatriz, S. Freitas, A. Paula Afonso, and A. Paula Cláudio, "Filtering mechanisms for the visualization of geo-referenced information", Proceedings of the 2005 workshop on Geographic information retrieval: ACM, pp. 1–4, 2005.
Freitas, S., and A. Paula Afonso, "Distributed Vector based Spatial Data Conflation Services", XII Brazilian Symposium on GeoInformatics, GeoInfo 2012, 2012.
Gomes, D., S. Freitas, and M. J. Silva, "Design and selection criteria for a national web archive", Research and Advanced Technology for Digital Libraries: Springer Berlin Heidelberg, pp. 196–207, 2006.