J. Broekstra, A. Kampman, and F. van Harmelen. The Semantic Web -- ISWC 2002: First International Semantic Web Conference Sardinia, Italy, volume 2342 of Lecture Notes in Computer Science, Springer, Berlin, (2002)
S. Lynden, I. Kojima, A. Matono, and Y. Tanimura. Databases in Networked Information Systems: 6th International Workshop, DNIS 2010, Aizu-Wakamatsu, Japan, (2010)