@misc{indiciae6fec88c26746,
  title = {Radiation from plutonium 238 used in space applications},
  author = {Keenan, T. K. and Vallee, R. E. and Powers, J. A.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19720010066},
  note = {Source identifier: 19720010066}
}