@misc{indiciae6f7adf79acc6,
  title = {Long-term cycles in cosmic X-ray sources},
  author = {Priedhorsky, W. C. and Holt, S. S.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880037093},
  note = {Source identifier: 19880037093}
}