P. Cimiano, S. Staab, and J. Tane. Proceedings of the ECML/PKDD Workshop on Adaptive Text Extraction and Mining, Cavtat-Dubrovnik, Croatia, page 10-17. (2003)
A. Farquhar, R. Fikes, W. Pratt, and J. Rice. (1995)Unpublished manuscript, Knowledge Systems Laboratory, Stanford University. Available at ftp://ftp.ksl.stanford.edu/pub/KSL_Reports/KSL-95-63.ps.gz..