O. O., Oyegbanren; O. OKWONNA, Obumneme; AKUMA, Oji A. A Comprehensive Review of Global Waste Lubricating Oil Re-Refining Technologies: Mechanisms, Performance, and Environmental Footprint. Engineering And Technology Journal, [S. l.], v. 10, n. 9, p. 7005–7015, 2025. DOI: 10.47191/etj/v10i09.20. Disponível em: https://everant.org/index.php/etj/article/view/2205. Acesso em: 28 sep. 2026.