Frederico T. Fonseca M. Andrea Rodríguez Sergei Levashkin GeoSpatial Semantics, Second International Conference, GeoS 2007, Mexico City, Mexico, November 29-30, 2007, Proceedings GeoS Lecture Notes in Computer Science 4853 Springer 2007 978-3-540-76875-3 db/conf/geos/geos2007.html