@misc{indiciae1a27f4d9c89b,
  title = {Interplays between Harper and Mathieu equations.},
  author = {E Papp and C Micu},
  year = {2001},
  doi = {10.1103/physreve.64.056203},
  url = {https://pubmed.ncbi.nlm.nih.gov/11736050/},
  note = {Source identifier: 11736050}
}