J. Jeon, V. Lavrenko, and R. Manmatha. Proceedings of the 26th Annual International ACM SIGIR Conference on Research and Development in Informaion Retrieval, page 119--126. New York, NY, USA, ACM, (2003)
J. Puzicha, T. Hofmann, and J. Buhmann. Computer Vision and Pattern Recognition, 1997. Proceedings., 1997
IEEE Computer Society Conf. on, page 267--272. (1997)
D. Ganguly, J. Leveling, W. Magdy, and G. Jones. Proceedings of the 20th ACM Conference on Information and
Knowledge Management, CIKM 2011, Glasgow, United Kingdom,
October 24-28, 2011, page 1953--1956. ACM, (2011)
I. Peters, L. Schumann, J. Terliesner, and W. Stock. Heinrich-Heine-University, Heinrich-Heine-University Department of Information Science Universitätsstraße1, 40225 Düsseldorf, Germany, (October 2011)