@misc{indiciae266c56cc0ae5,
  title = {Graded Multilayers not Required for Hard X-ray Imaging!},
  author = {Weisskopf, M. C. and Elsner, R. F. and Joy, M. K. and ODell, S. L.},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/19990042233},
  note = {Source identifier: 19990042233}
}