S. Dietze, H. Yu, D. Giordano, E. Kaldoudi, N. Dovrolis, and D. Taibi. Proceedings of the 27th Annual ACM Symposium on Applied Computing
(SAC-2012), Speical Track on Semantic Web and Applications, page 25-29. Trento, Italy, (March 2012)
R. Farrell, S. Liburd, and J. Thomas. Proceedings of the 13th international World Wide Web conference on
Alternate track papers & posters, page 162--169. New York, NY, USA, ACM, (2004)