Kullman, Leif, and Lisa Öberg. “Treeline Ecotone Progression and Stability: Time Series Analysis of Individual Photographic Data 1973-2021 in the Swedish Scandes”. European Journal of Applied Sciences 10, no. 2 (April 26, 2022): 468–498. Accessed May 30, 2026. https://scholarpublishing.org/journals/index.php/EJAS/article/view/8113.