1. R. Bardohl. Visual Definition of Visual Languages based on Algebraic Graph Transformation. PhD thesis, Technische Universität Berlin, 1999. Published by Verlag Dr. Kovac, 2000.
2. Software Architecture,1999
3. Algebraic Approaches to Graph Transformation II: Single Pushout Approach and Comparison with Double Pushout Approach;Ehrig,1997
4. H. Ehrig and B. Mahr. Fundamentals of Algebraic Specification 1: Equations and Initial Semantics, volume 6 of EATCS Monographs on Theoretical Computer Science. Springer Verlag, Berlin, 1985.
5. The AGG-Approach: Language and Tool Environment;Ermel,1999