@misc{indiciaed7f27fad77a7,
  title = {Variational method for approximating energy levels.},
  author = {Y Zhou and JD Mancini and PF Meier and SP Bowen},
  year = {1995},
  doi = {10.1103/physreva.51.3337},
  url = {https://pubmed.ncbi.nlm.nih.gov/9911973/},
  note = {Source identifier: 9911973}
}