WebSPHINX ( Website-Specific Processors for HTML INformation eXtraction) is a Java class library and interactive development environment for web crawlers.
J. Tane, C. Schmitz, G. Stumme, S. Staab, and R. Studer. Mobiles Lernen und Forschen - Beiträge der Fachtagung an der Universität, page 93-104. Kassel University Press, (November 2003)
T. Gruber, and G. Olsen. Proceedings of the 4th International Conference on Principles of Knowledge Representation and Reasoning (KR'94). Bonn, Germany, May 24-27, 1994., page 258-269. Morgan Kaufmann, (1994)