@misc{indiciae94fd1b098c49,
  title = {A system matrix for astigmatic optical systems: I. Introduction and dioptric power relations.},
  author = {M P Keating},
  year = {1981},
  doi = {10.1097/00006324-198110000-00006},
  url = {https://pubmed.ncbi.nlm.nih.gov/7304708/},
  note = {Source identifier: 7304708}
}