@misc{indiciae3f9fd2666004,
  title = {Exact perturbation theory for quantum-mechanical systems within boxes.},
  author = {FM Fernández and EA Castro},
  year = {1992},
  doi = {10.1103/physreva.46.7288},
  url = {https://pubmed.ncbi.nlm.nih.gov/9908066/},
  note = {Source identifier: 9908066}
}