@misc{indiciae3878f43c6c2c,
  title = {Hierarchical quantum Ising model.},
  author = {Z Lin and R Tao},
  year = {1990},
  doi = {10.1103/physrevb.41.11597},
  url = {https://pubmed.ncbi.nlm.nih.gov/9993588/},
  note = {Source identifier: 9993588}
}