1. Prolog-ELF incorporating fuzzy logic;Ishizuka,1985
2. Neural fuzzy logic programming;Eklund;IEEE Trans. Neural Netw.,1992
3. Theory of generalized annotated logic programming and its applications;Kifer;J. Log. Program.,1992
4. Fril-Fuzzy and Evidential Reasoning in Artificial Intelligence;Baldwin,1995
5. Fuzzy prolog based on Lukasiewicz implication and bounded product;Yasui,1995