M. Dean. Rules and Rule Markup Languages for the Semantic Web (RuleML 2004), volume 3323 of Lecture Notes in Computer Science (LNCS), page 1 - 5. Berlin / Heidelberg, Springer, (2004)
G. Wagner, A. Giurca, and S. Lukichev. Principles and Practices of Semantic Web Reasoning, 05371, Internationales Begegnungs- und Forschungszentrum fuer Informatik (IBFI), Schloss Dagstuhl, Germany, (2006)$<$http://drops.dagstuhl.de/opus/volltexte/2006/479$>$
date of citation: 2006-01-01.