The explanation of a genealogical relationship between Chukotian and Kamchadal is preferable to an areal explanation Michael Fortescue 2003 Stefan Georg and A. P. Volodin 1999: 224-247 . Parallels between Nivkh and Chukotko-Kamchatkan are insufficient to conclude a genealogical relationship Michael Fortescue 2011
Michael Dunn 2024: 661-665