Xing Wang, Z. M. Ma, Li Yan, Jingwei Cheng. If-Then and If-Then-Unless Rules in the Semantic Web. In 2009 IEEE/WIC/ACM International Conference on Web Intelligence, WI 2009, Milan, Italy, 15-18 September 2009, Main Conference Proceedings. pages 357-360, IEEE, 2009. [doi]
Abstract is missing.