@misc{indiciaed7c2f12071bf,
  title = {Thermal Characterization of a Direct Gain Solar Thermal Engine},
  author = {Alexander, Reginald A. and Coleman, Hugh W.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20000024853},
  note = {Source identifier: 20000024853}
}