Zusi R. L., Livezey B. C., 2000: Homology and phylogenetic implications of some enigmatic cranial features in galliform and anseriform birds. 37 pp. Annals of Carnegie Museum 69(3): 157-193.
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Zusi R. L., Livezey B. C., 2006: Variation in the os palatinum and its structural relation to the palatum osseum of birds (Aves). 44 pp. Annals of Carnegie Museum 75(3): 137-180.