@misc{indiciaefb9116ca8995,
  title = {Compact reflection nebulae, a transit phase of evolution from post-AGB to planetary nebulae},
  author = {Hu, J. Y. and Slijkhuis, S.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19910005716},
  note = {Source identifier: 19910005716}
}