“Investigation of the Physical and Chemical Properties of Spent Zinc Catalysts and the Process of Processing With Nitric Acid”. American Journal of Engineering , Mechanics and Architecture (2993-2637) 3, no. 4 (April 3, 2025): 1–4. Accessed February 4, 2026. https://www.grnjournal.us/index.php/AJEMA/article/view/7299.