@misc{indiciae056e17526ee6,
  title = {New transient source, Cepheus X-4, observed by OSO-7.},
  author = {Ulmer, M. P. and Baity, W. A. and Wheaton, W. A. and Peterson, L. E.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730058320},
  note = {Source identifier: 19730058320}
}