Abrupt and Gradual Extinction Among Late Permian Land Vertebrates in the Karoo Basin, South Africa.
Ward, Peter D.; Botha, Jennifer; Buick, Roger; De Kock, Michiel O.; Erwin, Douglas H.; Garrison, Geoffrey H.; Kirschvink, Joseph L.; Smith, Roger; Science, 2005, vol. 307, issue 5710, p 709, ISSN 00368075. ISBN 00368075.

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