@misc{indiciaedea54fa8e89f,
  title = {A Simplified Model for an Evolving Protoplanetary Nebula},
  author = {Davis, Sanford S. and Fonda, Mark L.},
  year = {2002},
  url = {https://ntrs.nasa.gov/citations/20030000486},
  note = {Source identifier: 20030000486}
}