@misc{indiciaeef3c714b9ced,
  title = {Three-dimensional tracking solar energy concentrator and method for making same},
  author = {Miller, C. G. and Pohl, J. G.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770025639},
  note = {Source identifier: 19770025639}
}