@article{9358,
  author = {Ludwig Oster},
  title = {The Free-Free Emission and Absorption Coefficients in the Radio Frequency Range at Very Low Temperatures},
  year = {1970},
  journal = {Astronomy and Astrophysics},
  volume = {9},
  chapter = {318},
  pages = {318-320},
  url = {http://adsabs.harvard.edu/full/1970A\%26A.....9..318O},
  note = {JILA Pub. 642},
}