@misc{indiciaed51e5ef74958,
  title = {Semiconductor grade, solar silicon purification project},
  author = {Ingle, W. M. and Thompson, S. and Rosler, D. and Jackson, J.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780016688},
  note = {Source identifier: 19780016688}
}