Kubilius, Šarūnas, and Arūnas Bukantis. “Changes of Palmer Drought Severity Index in the North Atlantic – European Sector Throughout the Warm Seasons of 1950–2015”. Vilnius University Proceedings 100 (May 19, 2020): 39. Accessed August 12, 2022. https://www.journals.vu.lt/proceedings/article/view/17956.