@misc{indiciae29f83eb38ed8,
  title = {The soft X ray excess in Einstein quasar spectra},
  author = {Wilkes, Belinda J. and Masnou, Jean-Louis and Elvis, Martin and Mcdowell, Jonathan and Arnaud, Keith},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900016594},
  note = {Source identifier: 19900016594}
}