@misc{indiciae4a06dea0d580,
  title = {Multimission observations of 4U 1538 - 52},
  author = {Cominsky, L. R. and Moraes, F.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910044047},
  note = {Source identifier: 19910044047}
}