@article{7287,
  author = {G. Wallerstein},
  title = {Symbiotic stars as an old disk population},
  year = {1981},
  journal = {The Observatory},
  volume = {101},
  pages = {172-174},
  url = {http://adsabs.harvard.edu/full/1981Obs...101..172W},
  note = {JILA Pub. 2249},
}