N. Fuhr, и K. Großjohann. Proceedings of the 24th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, стр. 172-180. ACM Press, (2001)
N. Fuhr, и K. Großjohann. Proceedings of the 24th Annual International Conference on Research and Development in Information Retrieval, стр. 172-180. New Orleans, Louisiana, (сентября 2001)