@misc{indiciaec1241d7c11a6,
  title = {Sputnik-style lenses.},
  author = {G Siemon and J E Witt},
  year = {1979},
  doi = {10.1016/s0146-2776(79)80059-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/479010/},
  note = {Source identifier: 479010}
}