W. Cavnar, and J. Trenkle. Proceedings of SDAIR-94, 3rd Annual Symposium on Document Analysis and Information Retrieval, page 161--175. Las Vegas, US, (1994)
C. Siefkes, F. Assis, S. Chhabra, and W. Yerazunis. PKDD '04: Proceedings of the 8th European Conference on Principles and Practice of Knowledge Discovery in Databases, page 410--421. New York, NY, USA, Springer-Verlag New York, Inc., (2004)