1. D. Barnocchi. L”Evidenza” nell'assiomatica aristotelica. Proteus, II,5 (1971), pp. 133–144.
2. Ch. Beierle and E. Börger. A WAM extension for type-constraint logic programming: Specification and correctness proof. Research report IWBS 200, IBM Germany Science Center, Heidelberg, December 1991.
3. Ch. Beierle, E. Börger, I. Durđanović U. Glässer, and E. Riccobene. An evolving algebra solution to the steam-boiler control specification problem. Seminar on Methods for Specification and Semantics (Dagstuhl, June 1995), Report, 1995.
4. D. Björner. A Formal Model of the Railway Application Domain System. UNU/IIST PRaCoSy Document no. SP/5/3, January 7, 1994, pages 1–19.
5. D. Björner. Domain Analysis, a Prerequisite for Requirements Capture. UNU/IIST Document, 1995.