@conference{4572,
  author = {S. Kwok},
  title = {Transition from red giant to planetary nebula},
  year = {1990},
  publisher = {San Francisco, CA, Astronomical Society of the Pacific},
  address = {Seattle, WA},
  url = {http://adsabs.harvard.edu/full/1990ASPC....9..438K},
  note = {JILA Pub. 4184},
}