H. Liu, H. Lieberman, and T. Selker. AH '02: Proceedings of the Second International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems, page 253--263. London, UK, Springer-Verlag, (2002)
S. Lee, P. Kim, Y. Ahn, and H. Jeong. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)