Selectivity of extinction among sea urchins at the end of the Cretaceous period. Smith, A. & Jeffery, C. Nature, 392:69-71, 1998.
Selectivity of extinction among sea urchins at the end of the Cretaceous period [pdf]Paper  Selectivity of extinction among sea urchins at the end of the Cretaceous period [pdf]Website  bibtex   

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