@article{64061,
  author = {Donald Sullivan},
  title = {What is the Basis for the Definition of the Second?},
  year = {2002},
  month = {2002-01-01},
  publisher = {Scientific American},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105572},
  language = {en},
}