@misc{indiciaead8e7845d9b9,
  title = {Perturbation theory with canonical transformations.},
  author = {FM Fernández},
  year = {1992},
  doi = {10.1103/physreva.45.1333},
  url = {https://pubmed.ncbi.nlm.nih.gov/9907112/},
  note = {Source identifier: 9907112}
}