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Early Triassic Productivity Crises Delayed Recovery from World's Worst Mass Extinction; Grasby, S E; Beauchamp, B; Knies, J.
Geology vol. 44, no. 9, 2016 p. 779-782,
https://doi.org/10.1130/G38141.1 
Open Access (ESS Cont.# 20160080)