@misc{indiciaeff698e1888f7,
  title = {Deep impurity levels in semiconductor superlattices.},
  author = {SY Ren and JD Dow and J Shen},
  year = {1988},
  doi = {10.1103/physrevb.38.10677},
  url = {https://pubmed.ncbi.nlm.nih.gov/9945923/},
  note = {Source identifier: 9945923}
}