@article{7527,
  author = {G. Wallerstein},
  title = {The behavior of H-alpha in the 16-day cepheid X Cygni},
  year = {1983},
  journal = {Publications of the Astronomical Society of the Pacific},
  volume = {95},
  pages = {422},
  month = {Jan-01-1983},
  issn = {0004-6280},
  url = {http://adsabs.harvard.edu/full/1983PASP...95..422W},
  doi = {10.1086/131187},
}