S. Ju, M. Black, S. Minneman, and D. Kimber. Conference on Computer Vision and Pattern Recognition (CVPR '97), San Juan, Puerto Rico, page 595-. (1997)
W. Kraaij, and J. Arlandis. in Proceedings Text Retrieval Conference (TREC), Gaithersburg, MD, November 2004. National Institute of Standards and Technology Special Publication, (2004)
H. Sack, and J. Waitelonis. In Proceedings of the ESWC 2006 Workshop on Mastering the Gap: From Information Extraction to Semantic Representation, CEUR Workshop Proceedings, (Jun 12, 2006)