Rolf Theil (2006) Is Omotic Afro-Asiatic? pp 1–2: "I claim to show that no convincing arguments have been presented [for the inclusion of Omotic (OM) in Afro-Asiatic (AA)], and that OM should be regarded as an independent language family. No closer genetic relations have been demonstrated between OM and AA than between OM and any other language family."
