@misc{indiciaec53275a027c1,
  title = {Computer programs for shielding problems in manned space vehicles},
  author = {Douglass, C. C., Jr. and Hill, C. W. and Ritchie, W. B. and Simpson, K. M., Jr.},
  year = {1964},
  url = {https://ntrs.nasa.gov/citations/19650021233},
  note = {Source identifier: 19650021233}
}