@misc{indiciaea5d3019cf673,
  title = {Orbital period changes in Centaurus X-3},
  author = {Kelley, R. L. and Rappaport, S. and Clark, G. W. and Petro, L. D.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19830052887},
  note = {Source identifier: 19830052887}
}