@misc{indiciae12df68e10904,
  title = {Double-focusing mass spectrometer},
  author = {Giffin, C. E. and Nier, A. O. and Sieradski, L. M.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19760000183},
  note = {Source identifier: 19760000183}
}