Manfred Nagl. Formal languages of labelled graphs. Computing, 16(1-2):113-137, 1976. [doi]
@article{Nagl76, title = {Formal languages of labelled graphs}, author = {Manfred Nagl}, year = {1976}, doi = {10.1007/BF02241984}, url = {http://dx.doi.org/10.1007/BF02241984}, tags = {graph-rewriting, rewriting}, researchr = {https://researchr.org/publication/Nagl76}, cites = {0}, citedby = {0}, journal = {Computing}, volume = {16}, number = {1-2}, pages = {113-137}, }