1. J.M. Andreoli and R. Pareschi. Linear Objects: logical processes with built-in inheritance. In D. H. Warren and P. Szeredi, editors, The Seventh International Conference on Logic Programming, pages 495–510. MIT press, 1990.
2. J.F. Baldwin. Evidential Logic Rules from Examples. In Proc. EUFIT-94, Aachen, 1994.
3. J.F. Baldwin. Soft Computing in Fril. In Proc. EUFIT-94, Aachen, 1994.
4. J.F. Baldwin, T.P. Martin, and B.W. Pilsworth. The Implementation of Prolog—a Fuzzy Prolog Interpreter. Fuzzy Sets and Systems, 23:119–129, 1987.
5. J.F. Baldwin, T.P. Martin, and B.W. Pilsworth. Fril Reference Manual. Fril Systems LTD, 1988.