A. I. ABD EL GAWWAD, S. A. EL-KADY, A. E. KASSEM, M. I. HAMED, R. LÁSZTITY, and M. M. RABIE, “EFFECT OF DIFFERENT ALKALI CONCENTRATIONS DURING THE REFINING PROCESS ON THE OXIDATIVE STABILITY OF SUNFLOWER AND SOYBEAN OILS”, Period. Polytech. Chem. Eng., vol. 37, no. 3-4, pp. 127–133, Jan. 1993.