@misc{indiciae20a08e772d44,
  title = {Photovoltaic system},
  author = {Lutkefeder, N. and Leonard, S. L. and Magid, L. M.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19760005385},
  note = {Source identifier: 19760005385}
}