Esper, J., Frank, D., Büntgen, U., Verstege, A., Hantemirov, R. M., & Kirdyanov, A. V. (2010). Trends and uncertainties in Siberian indicators of 20th century warming. Global Change Biology, 16(1), 386-398. https://doi.org/10.1111/j.1365-2486.2009.01913.x