@misc{indiciae3adb4fa36faf,
  title = {Angle eikonals for a perfect zoom system.},
  author = {A Walther},
  year = {2001},
  doi = {10.1364/josaa.18.001968},
  url = {https://pubmed.ncbi.nlm.nih.gov/11488501/},
  note = {Source identifier: 11488501}
}