H. Ehrig, H. Kreowski, and G. Taentzer. Dagstuhl Seminar on Graph Transformations in Computer Science, volume 776 of Lecture Notes in Computer Science, page 153-169. Springer, (1993)
H. Ehrig, and J. Staples. Graph-Grammars and Their Application to Computer Science, volume 153 of Lecture Notes in Computer Science, page 82-101. Springer, (1982)