ALLEN, M. A.; NWOSU-OBIEOGU, K.; EROKARE, T. E.; OKOYE, J.; FRANCIS, M. U.; NWOGU, C. N.; ITIRI, H. Transesterification of Waste Frying Oil Using Alkaline Activated Waste Marble Catalyst: Effects of Process Parameters, Modeling, and Optimization. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, v. 21, n. 3, p. 717 - 731, 1 Sep. 2025.