@article{40656,
  author = {Alan Migdall},
  title = {Correlated-Photon Metrology without Absolute Standards},
  year = {1999},
  number = {52},
  month = {1999-01-01},
  publisher = {Physics Today},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=104036},
  language = {en},
}