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W. M.  Bowden, ?The taxonomy and nomenclature of the wheats, barelys, and ryes and their wild relatives?, Canadian Journal of Botany, vol. 37, pp. 657-684, 1959.

B. R.  Baum, ?Taxonomy of the tribe Triticeae (Poaceae) using various numerical taxonomic techniques  III. Synoptic key to genera and synopses?, Canadian Journal of Botany, vol. 56, pp. 374-385, 1978.