F. Branin. Proceedings of the Symposium on Generalized Networks, volume 16 of Microwave Research Institute Symposia Series, page 453--491. Polytechnic Press of the Polytechnic Institute of Brooklyn, (1966)
M. Minas. Applications of Graph Transformations with Industrial Relevance, volume 1779 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2000)