Burlutskyy, Mykola. “Germanium in Lignite: The Evolution of Environmentally Safe Extraction Technologies”. Visnyk of Taras Shevchenko National University of Kyiv. Geology 2, no. 113 (May 29, 2026): 50–56. Accessed September 24, 2026. https://geology.bulletin.knu.ua/article/view/10457.