@article{10623,
  author = {D. van Blerkom},
  title = {Indications of circumstellar ring systems from SiO and H2O maser lines},
  year = {1978},
  journal = {The Astrophysical Journal},
  volume = {223},
  pages = {835},
  month = {Jan-08-1978},
  issn = {0004-637X},
  url = {http://adsabs.harvard.edu/full/1978ApJ...223..835V},
  doi = {10.1086/156316},
}