Yingtan Li. Equivalent formula of S4 system & its application in NLU & TMT. In Proceedings of the IEEE International Conference on Systems, Man & Cybernetics: "e-Systems and e-Man for Cybernetics in Cyberspace", Tucson, Arizona, USA, 7-10 October 2001. pages 506-511, IEEE, 2001. [doi]
Abstract is missing.