@misc{indiciaeea3e2d533605,
  title = {Liquid hydrogen densitometer utilizes open-ended microwave cavity},
  author = {Smetana, J. and Wenger, N. C.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670000115},
  note = {Source identifier: 19670000115}
}