The concept is due to Harold C. Fleming (1987), who proposed such a "mega-super-phylum" for the languages of Eurasia, termed Borean or Boreal in Fleming (1991) and later publications.
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Dené–Caucasian (speculative, Nikolayev 1991; expanded by Bengtson 1997), c.f. Dené–Yeniseian (Edward Vajda 2008)
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