1. OMG. Unified Modeling Language, http://www.omg.org/
2. The HOL system, http://hol.sourceforge.net/
3. Warmer, J., Kleppe, A.: The object constraint language: precise modeling with UML. Addison-Wesley, Reading (1999)
4. Nipkow, T., von Oheimb, D., Pusch, C.: μJava: Embedding a Programming Language in a Theorem Prover. In: Foundations of Secure Computation. IOS Press, Amsterdam (2000)
5. Jacobs, B., et al.: LOOP project, http://www.cs.kun.nl/~bart/LOOP/