Jean Pillet; La classification des Phacopacea (trilobites). Bulletin de la Société Géologique de France ; S6-III (9): 817–839. doi: https://doi.org/10.2113/gssgfbull.S6-III.9.817
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Proposes a new classification of the Phacopacea, in which three new subfamilies (Chasmopsinae, Eomonoracheinae, and Coronurinae) are created, and several subfamilies elevated to the rank of family. Five new genera and subgenera are described.
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