:This article " Linguistic Relations Across the Bering Strait " might be a good start " Language Phyla of the Indo-Pacific Region " [ https : / / journals . lib . washington . edu / index . php / BIPPA / article / viewFile / 11699 / 10328 lists " Chukchi-Kamchadal " as a phylum, and gives an overview of relationships and further refs in section 2.4.
