@article{Higman65,
  title = {Correspondence},
  author = {B. Higman},
  year = {1965},
  doi = {10.1093/comjnl/8.2.175},
  url = {https://doi.org/10.1093/comjnl/8.2.175},
  researchr = {https://researchr.org/publication/Higman65},
  cites = {0},
  citedby = {0},
  journal = {Comput. J.},
  volume = {8},
  number = {2},
  pages = {175},
}