@article{4823,
  author = {D. Sullivan and Judah Levine},
  title = {Time generation and distribution},
  year = {1991},
  journal = {Proceedings of the IEEE},
  volume = {79},
  pages = {906-914},
  month = {Jan-07-1991},
  issn = {00189219},
  doi = {10.1109/5.84966},
}