@misc{indiciaeef9ef34239e0,
  title = {Imaging the sun in hard X-rays - Spatial and rotating modulation collimators},
  author = {Campbell, Jonathan W. and Davis, John M. and Emslie, A. G.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19930050389},
  note = {Source identifier: 19930050389}
}