Usenko, O.V. “The Development of the Ukrainian Shield Was 2.7-2.3 Billion Years Ago. Facts and Preliminary Conclusions”. Reports of the National Academy of Sciences of Ukraine, no. 12 (December 28, 2018): 61–70. Accessed June 19, 2026. https://nasu-periodicals.org.ua/index.php/dp/article/view/3054.