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- Lieberman, B.S.; Kloc, G.J. (1997). "Evolutionary and biogeographic patterns in the Asteropyginae (Trilobita, Devonian) Delo, 1935". Bulletin of the American Museum of Natural History 232: 127.
- S. M. Gon III. "Order Phacopida". Archived from the original on 6 January 2011. Retrieved December 1, 2010.
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