@misc{indiciae393cd4ec332f,
  title = {Level repulsion in integrable and almost-integrable quantum spin models.},
  author = {TC Hsu and Anglès d'Auriac JC},
  year = {1993},
  doi = {10.1103/physrevb.47.14291},
  url = {https://pubmed.ncbi.nlm.nih.gov/10005774/},
  note = {Source identifier: 10005774}
}