@misc{indiciaeb8056b8130c3,
  title = {A method of eliminating hydrogen maser wall shift},
  author = {Levine, M. W. and Vessot, R. F. C.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720000669},
  note = {Source identifier: 19720000669}
}