Structural connections in formal languages

Edgar T. Irons. Structural connections in formal languages. Communications of the ACM, 7(2):67-72, 1964. [doi]

@article{Irons64,
  title = { Structural connections  in formal languages},
  author = {Edgar T. Irons},
  year = {1964},
  doi = {10.1145/363921.363931},
  url = {http://doi.acm.org/10.1145/363921.363931},
  researchr = {https://researchr.org/publication/Irons64},
  cites = {0},
  citedby = {0},
  journal = {Communications of the ACM},
  volume = {7},
  number = {2},
  pages = {67-72},
}