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- McElwain, J.C. and Punyasena, S.W. (2007). Mass extinction events and the plant fossil record. Trends in Ecology & Evolution 22 (10): 548-557.
- Retallack GJ Veevers JJ & Morante R (1996). Global coal gap between Permian–Triassic extinctions and middle Triassic recovery of peat forming plants. GSA Bulletin 108 (2): 195–207.
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