@misc{indiciae4b7bfa10b406,
  title = {Achromatic optical elements.},
  author = {Anatoly M Smolovich},
  year = {2006},
  doi = {10.1364/ao.45.007871},
  url = {https://pubmed.ncbi.nlm.nih.gov/17068522/},
  note = {Source identifier: 17068522}
}