@misc{indiciae5e710e006130,
  title = {Trace maps associated with general two-letter substitution rules.},
  author = {M Kolá and MK Ali},
  year = {1990},
  doi = {10.1103/physreva.42.7112},
  url = {https://pubmed.ncbi.nlm.nih.gov/9904026/},
  note = {Source identifier: 9904026}
}