@misc{indiciae471668ebc509,
  title = {Venus and Mars nominal natural environment for advanced manned planetary mission programs},
  author = {Evans, D. E. and Kraus, G. L. and Pitts, D. E.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670015713},
  note = {Source identifier: 19670015713}
}