@misc{indiciaeb57dd3af6a4d,
  title = {Martian regolith as space radiation shielding},
  author = {Simonsen, L. C. and Nealy, J. E. and Townsend, L. W. and Wilson, J. W.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910048753},
  note = {Source identifier: 19910048753}
}