@misc{indiciae7548e9f25f15,
  title = {A method for eliminating the wall shift in the atomic hydrogen maser},
  author = {Levine, M. W. and Vessot, R. F. C.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19710059504},
  note = {Source identifier: 19710059504}
}