1. ANSI Report No. X3H4/93-196, IRDS Conceptual Schema (1993)
2. ANSI Report No. X3T2/95-019r2, Information Interchange and Interpretation (1995)
3. Baldwin, J.F., Martin, T.P., Pilsworth, B.W.: Fril - Fuzzy and Evidential Reasoning in Artificial Intelligence. Research Studies Press, Hertfordshire (1995)
4. Barwise, J., Cooper, R.: Generalized Quantifiers and Natural Language. Linguistics and Philosophy 4, 159–219 (1981)
5. Cao, T.H.: Foundations of Order-Sorted Fuzzy Set Logic Programming in Predicate Logic and Conceptual Graphs. PhD Thesis, University of Queensland (1999)