1. Arrows, Structures, and Functors;Arbib,1975
2. Grundlegende Datenstrukturen und Algorithmen zur Implementierung von algebraischen Graph Grammatiken;Arlt,1989
3. Towards distributed graph grammars;Boehm,1987
4. Amalgamation of graph transformations: a synchronization mechanism;Boehm;J. Comput. System Sci.,1987
5. Algebraic graph rewriting using a single pushout;van den Broek,1991