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Stinnesbeck, W.; López-Oliva, J. G.; Frey, E.; Ifrim, C.; Giersch, S. The Oldest Stratigraphic Record of the Late Cretaceous Shark Ptychodus Mortoni Agassiz, from Vallecillo, Nuevo León, Northeastern Mexico.
revmexcg
2018
,
25
, 365-366.