@misc{indiciae1d8d8ed44194,
  title = {X-ray observations of planetary nebulae with binary nuclei},
  author = {Apparao, K. M. V. and Berthiaume, G. D. and Nousek, J. A.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930026495},
  note = {Source identifier: 19930026495}
}