@misc{indiciaeb7c283ea50ab,
  title = {Ion-beam sputtering increases solar-cell efficiency},
  author = {Burk, D. E. and Dubow, J. B. and Sites, R. R.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770000319},
  note = {Source identifier: 19770000319}
}