@misc{indiciae21e5984b593a,
  title = {Evaluation of various approximations used in the envelope-function method.},
  author = {AT Meney and B Gonul and EP O'Reilly},
  year = {1994},
  doi = {10.1103/physrevb.50.10893},
  url = {https://pubmed.ncbi.nlm.nih.gov/9975192/},
  note = {Source identifier: 9975192}
}