@misc{indiciae1d8e224c269d,
  title = {Optical observations of Sanduleak 160.},
  author = {Petro, L. and Feldman, F. and Hiltner, W. A.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730058321},
  note = {Source identifier: 19730058321}
}