@misc{indiciae5002c6b548e4,
  title = {The Einstein /HEAO 2/ X-ray Observatory},
  author = {Giacconi, R. and Branduardi, G. and Briel, U. and Epstein, A. and Fabricant, D. and Feigelson, E. and Holt, S. S. and Becker, R. H. and Boldt, E. A. and Serlemitsos, P. J.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790053787},
  note = {Source identifier: 19790053787}
}