中国科学院数学与系统科学研究院期刊网
Theory of Truth Degrees in Lukasiewicz n-Valued Propositional Logic
Jun LI,Suo Ping LI,Ya Feng XIA
Acta Mathematica Sinica, Chinese Series . 2004, (4): 769 -780 .  DOI: 10.12386/A2004sxxb0098