D. R. Setiani, A. R. . Widianti, F. . Salsabila, A. . Anggraeni, H. H. . Bahti, and U. . Pratomo, “The Effect of Surfactants on Separation of Light Rare Earth Metals using Emulsion Liquid Membrane Method: Review”, J. Akademika Kimia, vol. 11, no. 1, pp. 46–55, Feb. 2022.