@misc{indiciae8947d9a1e5f9,
  title = {Symbolic dynamics for the gap map.},
  author = {WM Zheng},
  year = {1989},
  doi = {10.1103/physreva.39.6608},
  url = {https://pubmed.ncbi.nlm.nih.gov/9901268/},
  note = {Source identifier: 9901268}
}