Rusdi, H. O.; Kusumaningrum, I. K.; Nareswari, T. J.; Fauziah, P. N.; Maharani, R. N.; Natasya, S. Separation and Determination of Free Fatty Acids in Corn Oil and Palm Oil by Liquid-Liquid Extraction and Acidi-Alkalimetric Titration. Walisongo J. Chem. 2024, 7, 98-106.