@article{Frank_2016,
  doi = {10.1089/ast.2015.1418},
  url = {http://dx.doi.org/10.1089/ast.2015.1418},
  year = {2016},
  month = {may},
  publisher = {Mary Ann Liebert Inc},
  volume = {16},
  number = {5},
  pages = {359--362},
  author = {A. Frank and W.T. Sullivan},
  title = {{A New Empirical Constraint on the Prevalence of Technological Species in the Universe}},
  journal = {Astrobiology},
}
