@misc{1199506,
  author = {Gwen E Bennett},
  title = {Time & frequency bulletin no. 377:},
  year = {1989},
  month = {1989-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.89-3910-4},
  language = {en},
}