@misc{69931,
  author = {Eyvon Petty},
  title = {NIST Time and Frequency Bulletin},
  year = {2009},
  number = {6656-09},
  month = {2009-01-05},
  publisher = {NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD},
  language = {en},
}