P. Brandtzæg, A. Følstad, M. Obrist, D. Geerts, and R. Berg. UCMedia, volume 40 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 50-57. Springer, (2009)
D. Geerts. UCMedia, volume 40 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 357-360. Springer, (2009)