Koubarakis, M. Karpathiotakis, M. Kyzirakos, K. Nikolaou, C. Vassos, S. Garbis, G. Sioutis, M. Bereta, K. Manegold, S. Kersten, M. Ivanova, M. Pirk, H. Zhang, Y. Kontoes, C. Papoutsis, I. Herekakis, T. Mihail, D. Datcu, M. Schwarz, G. Dumitru, O. Molina, D. Molch, K. Giammatteo, U. Sagona, M. Perelli, S. Klien, E. Reitz, T. Gregor, R., Building virtual earth observatories using ontologies and linked geospatial data, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), (7497 LNCS), 229-233, 2012, Springer-Verlag,