@misc{indiciaef6e7c8af9901,
  title = {A soft X-ray imaging system for satellite experiments.},
  author = {Ballas, J. and Knapp, G. and Wiza, J. and Zehnpfennig, T.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680053566},
  note = {Source identifier: 19680053566}
}