@misc{indiciaed776af8ad2e7,
  title = {Interaction of planetary nebulae with the interstellar medium},
  author = {Borkowski, Kazimierz J. and Sarazin, Craig L. and Soker, Noam},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900059266},
  note = {Source identifier: 19900059266}
}