Zebarjad, Kiarash, and Soniya Behzadinasab. “Circular Re-Refining of Spent Lubricants via Supercritical CO₂ Extraction: Process Optimization and Life-Cycle Assessment”. Research Annals of Industrial and Systems Engineering (August 19, 2026). Accessed August 24, 2026. https://raise.reapress.com/journal/article/view/85.