@misc{indiciae41ed10ce09cf,
  title = {Constant current source for instrument calibration.},
  author = {Aebersold, P. M. and Gillespie, F. E. and Santoro, R. T.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660056519},
  note = {Source identifier: 19660056519}
}