GeoSpatial semantics second international conference, GeoS 2007, Mexico City, Mexico, November 29-30, 2007 : proceedings /

gan International Conference on Geospatial Semantics, Fonseca, Frederico., Rodriguez, M. Andrea., Levashkin, Sergei.
Cyhoeddwyd 2007.

GeoSpatial semantics third international conference, GeoS 2009, Mexico City, Mexico, December 3-4, 2009 : proceedings /

gan International Conference on Geospatial Semantics, Janowicz, Krzysztof, Raubal, Martin M., Levashkin, Sergei.
Cyhoeddwyd 2009.