Avdieieva, Lesia, Andrii Makarenko, Tetiana Turchyna, and Hanna Dekusha. “TRADITIONAL AND MODERN APPROACHES TO EXTRACTING LIGNITE-DERIVED HUMIC ACIDS”. European Science 7, no. sge41-07 (June 30, 2025): 110–118. Accessed December 5, 2025. https://desymp.promonograph.org/index.php/sge/article/view/sge41-07-003.