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An abrupt extinction in the Middle Permian (Capitanian) of the Boreal Realm (Spitsbergen) and its link to anoxia and
; Bond, D P G; Wignall, P B; Joachimski, M M; Sun, Y; Savov, I; Grasby, S E; Beauchamp, B; Blomeier, D P G.
Geological Society of America Bulletin 2015 p. 1-12, https://doi.org/10.1130/B31216.1
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