@misc{indiciae080d62217dcb,
  title = {A spaceborne hydrogen maser designs},
  author = {Popa, A. E. and Wang, H. T. M. and Bridges, W. B. and Etter, J. E. and Schnelker, D. and Goodwin, F. E. and Lew, C. and Dials, M.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19840071651},
  note = {Source identifier: 19840071651}
}