1. Lecture Notes in Artificial Intelligence;S. Autexier,1999
2. CoFI Language Design Task Group. The common algebraic specification language ( Casl) – summary, 1998. Version 1.0 and additional Note S-9 on Semantics, available from
http://www.brics.dk/Projects/CoFI
3. Cerioli, M., Meseguer, J.: May I borrow your logic? Theoretical Computer Science 173(2), 311–347 (1997)
4. Diaconescu, R., Goguen, J., Stefaneas, P.: Logical support for modularization. In: Huet, G., Plotkin, G. (eds.) Workshop on Logical Frameworks (1991)
5. Hennicker, R., Wirsing, M., Bidoit, M.: Proof systems for structured specifications with observability operators. Theoretical Computer Science 173(2), 393–443 (1997)