@inproceedings{Campbell20d,
  author    = {Graham Campbell},
  editor    = {Patrick Bahr},
  title     = {Parallel Hyperedge Replacement String Languages},
  booktitle = {Pre-Proc.\ 11th International Workshop on Computing with Terms and Graphs ({TERMGRAPH} 2020)},
  year      = {2020},
  url       = {https://cdn.gjcampbell.co.uk/2020/PHRS-Languages-Preproc.pdf},
}