W. Martins, M. Goncalves, A. Laender, и G. Pappa. Proceedings of the 9th ACM/IEEE-CS Joint Conference on Digital Libraries, стр. 193--202. New York, NY, USA, ACM, (2009)
S. Pohl, F. Radlinski, и T. Joachims. Proceedings of the 7th ACM/IEEE-CS Joint Conference on Digital Libraries, стр. 417--418. New York, NY, USA, ACM, (2007)