@article{4536,
  author = {I. Howarth and Ulrich Heber},
  title = {The spectroscopic orbit and evolution of HD 128220, a system containing an O subdwarf},
  year = {1990},
  journal = {Publications of the Astronomical Society of the Pacific},
  volume = {102},
  pages = {912},
  month = {Jan-12-1990},
  issn = {0004-6280},
  url = {http://articles.adsabs.harvard.edu/full/1990PASP..102..912H},
  doi = {10.1086/132716},
}