@misc{indiciae2721d2493456,
  title = {Nuclear techniques for measuring propellant mass aboard orbiting space vehicles.},
  author = {Cho, B. Y. and Evans, H. J. and Pfeifer, R. J.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680044667},
  note = {Source identifier: 19680044667}
}