@misc{indiciaeab2010d3fe18,
  title = {Aplanatic telescope for soft x rays.},
  author = {Giacconi, R. and Harmon, N. F. and Lacey, R. F. and Szilagyi, Z.},
  year = {1965},
  url = {https://ntrs.nasa.gov/citations/19650038034},
  note = {Source identifier: 19650038034}
}