Klapper, G.; Bergström, S. M. (1984). The enigmatic Middle Ordovician fossil Archeognathus and its relations to conodonts and vertebrates. Journal of Paleontology. 58(4): 949-976.
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Klapper, G.; Bergström, S. M.
1984
The enigmatic Middle Ordovician fossil Archeognathus and its relations to conodonts and vertebrates