F. Belém, E. Martins, T. Pontes, J. Almeida, and M. Gonçalves. Proceedings of the 34th international ACM SIGIR conference on Research and development in Information Retrieval, page 1033--1042. New York, NY, USA, ACM, (2011)
K. Bischoff, C. Firan, C. Kadar, W. Nejdl, and R. Paiu. ADMA '09: Proceedings of the 5th International Conference on Advanced Data Mining and Applications, volume 5678 of Lecture Notes in Computer Science, page 31--42. Berlin, Heidelberg, Springer, (2009)
K. Bischoff, C. Firan, W. Nejdl, and R. Paiu. Proceedings of the 17th ACM Conference on Information and Knowledge Management, page 193--202. New York, NY, USA, ACM, (2008)