@misc{indiciaead0ec9640930,
  title = {Semiconductor grade, solar silicon purification project},
  author = {Ingle, W. M. and Rosler, R. R. and Thompson, S. W. and Chaney, R. E.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800008235},
  note = {Source identifier: 19800008235}
}