Unusual twentieth-century summer warmth in a 1,000-year temperature record from Siberia

Briffa KR, Jones PD, Schweingruber FH, Shiyatov SG & Cook ER
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Briffa, K. R., Jones, P. D., Schweingruber, F. H., Shiyatov, S. G., & Cook, E. R. (1995). Unusual twentieth-century summer warmth in a 1,000-year temperature record from Siberia. Nature, 376, 156-159.