1. The Unified Modeling Language Reference Manual;Rumbaugh,1998
2. Object Management Group, Object Constraint Language Specification, OMG Document formal/01-9-77. September 2001
3. Handbook of Graph Grammars and Computing by Graph Transformation;Rozenberg,1997
4. Blostein D, Schürr A., “Computing with Graphs and Graph Rewriting”, Technical Report AIB 97-8, Fachgruppe Informatik, RWTH Aachen, Germany
5. Attributed graph grammars for graphics;Gottler,1982