Nikos Mamoulis Thomas Seidl Torben Bach Pedersen Kristian Torp Ira Assent Advances in Spatial and Temporal Databases, 11th International Symposium, SSTD 2009, Aalborg, Denmark, July 8-10, 2009, Proceedings 5644 2009 http://dx.doi.org/10.1007/978-3-642-02982-0 978-3-642-02981-3 SSTD Lecture Notes in Computer Science Springer db/conf/ssd/sstd2009.html