@misc{indiciaec592421ed17b,
  title = {Casimir light: the source.},
  author = {J Schwinger},
  year = {1993},
  doi = {10.1073/pnas.90.6.2105},
  url = {https://pubmed.ncbi.nlm.nih.gov/11607373/},
  note = {Source identifier: 11607373}
}