@misc{indiciae8392019c313c,
  title = {Some recent progress in microwave frequency and time standards at the NBS},
  author = {Allan, D. W. and Benson, R. J. and Busca, G. and Garvey, R. M. and Hellwig, H. and Howe, D. A. and Jarvis, S. and Risley, A. and Stein, S. R. and Walls, F. L.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19840071647},
  note = {Source identifier: 19840071647}
}