The Dene-Caucasian (or Sino-Caucasian) language family is a conjectural macrofamily containing the Sino-Tibetan, North Caucasian, and Na-Dene languages. The theory, first scientifically formulated in the 1980's by Sergei Starostin, is based in large part on the work of Alfredo Trombetti , Karl Bouda , and Edward Sapir. Many linguists, in particular John Bengtson , have proposed including Basque as well. However, due to the uncertainty of comparative linguistics, this has never been demonstrated unequivocally.
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