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Chernykh BVV, Chuvashov BI, Shen SZ, Henderson CM, Yuan DX, , Stephenson MH.  The Global Stratotype Section and Point (GSSP) for the base- Sakmarian Stage (Cisuralian, Lower Permian).  Episodes 2020;43:961-979.  https://doi.org/10.18814/epiiugs/2020/020059