S. Heymans, C. Feier, и T. Eiter. Proceedings of the 3rd International Conference on Web Reasoning and Rule Systems (RR 2009), том 5837 из Lecture Notes in Computer Science, стр. 55-70. Chantilly, USA, Springer, (октября 2009)
M. Rodriguez, J. Bollen, и H. de Sompel. JCDL '07: Proceedings of the 7th ACM/IEEE-CS joint conference on Digital libraries, стр. 278--287. New York, NY, USA, ACM, (2007)