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The Origin and Initial Rise of Pelagic Cephalopods in the Ordovician
Kröger B,
Servais T,
Zhang Y
(2009)
The Origin and Initial Rise of Pelagic Cephalopods in the Ordovician.
PLOS ONE 4(9): e7262.
https://doi.org/10.1371/journal.pone.0007262