@misc{indiciaed8a8c2ddd8ef,
  title = {X-ray density changes in the human heel during bed rest},
  author = {Hurxthal, L. M. and Vose, G. P.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700041734},
  note = {Source identifier: 19700041734}
}