@misc{indiciae4467bd4670fc,
  title = {Achromatic optical vortex lens.},
  author = {Grover A Swartzlander},
  year = {2006},
  doi = {10.1364/ol.31.002042},
  url = {https://pubmed.ncbi.nlm.nih.gov/16770426/},
  note = {Source identifier: 16770426}
}