@article{780,
  author = {Judah Levine and M. Lombardi and A. Novick},
  title = {NIST Spec. Publ. 250-59},
  year = {2002},
  url = {http://www.nist.gov/calibrations/upload/sp250-59.pdf},
  note = {JILA Pub. 6943},
}