@misc{indiciaef583b068628f,
  title = {WINDOWLESS TUBES FOR X-RAY SPECTROSCOPY},
  author = {Davidson, F. D. and Wyckoff, R. W. G.},
  year = {1963},
  url = {https://ntrs.nasa.gov/citations/19630009598},
  note = {Source identifier: 19630009598}
}