@misc{indiciae1e4cdb9ba550,
  title = {Improvement of filament-protection circuitry in a Finnigan model 251 mass spectrometer},
  author = {J. D. Wildman},
  year = {1986},
  doi = {10.3133/ofr86484},
  url = {https://pubs.usgs.gov/publication/ofr86484},
  note = {Source identifier: ofr86484}
}