“SODA LIGNIN FROM PRE-TREATED BIRCH RESIDUE AND ITS POSSIBLE APPLICATION IN BIOCOMPOSITE”. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 11, 2025): 497–502. Accessed March 11, 2026. https://archive-journals.rtu.lv/etr/article/view/4948.