@misc{indiciaeb7d71ed5f0fe,
  title = {Process for purification of solids},
  author = {Herzer, H. and Rath, H. J. and Schmidt, D.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810010819},
  note = {Source identifier: 19810010819}
}