オモ語派
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Lamberti, Marcello. 1991. Cushitic and its classification. Anthropos 86(4/6):552-561.
Zaborski, Andrzej. 1986. Can Omotic be reclassified as West Cushitic? In Gideon Goldenberg, ed., Ethiopian Studies: Proceedings of the 6th International Conference, pp. 525–530. Rotterdam: Balkema.