@incollection{Comrie2006,
  author    = {Bernard Comrie},
  title     = {From potential to realisation: an episode in the origin of language},
  url       = {http://edoc.bbaw.de/oa/series/reXaIF2DOtIqw/PDF/20mD5eCLI1Ih2_192.pdf},
  year      = {2006},
}