@article{Leith83,
  title = {Hierarchically Structured Production Rules},
  author = {Philip Leith},
  year = {1983},
  tags = {rule-based, rules},
  researchr = {https://researchr.org/publication/Leith83},
  cites = {0},
  citedby = {0},
  journal = {Comput. J.},
  volume = {26},
  number = {1},
  pages = {1-5},
}