1. Handbook of;Apt,1990
2. Fuzzy unification as a foundation of fuzzy logic programming. In: editors. Logic programming and soft computing?Uncertainty theory in artificial intelligence series. England: Research Studies Press, Wiley; 1998.
3. LIKELOG: A logic programming language for flexible data retrieval. In: Proc ACM?SAC'99. San Antonio, TX; March 1999. pp 260-267.
4. A Note on Fuzzy Deduction
5. FRIL?Fuzzy and evidential reasoning in AI. Research Studies Press; 1995.