Ahmad, M., I. Md Isa, and M. I. Saleh. “Penentuan Pemalar-Pemalar Kestabilan Kompleks-Kompleks Lantanida La(III), Pr(III), Eu(III), Ga(III), Er(III) Dan Lu(III) Dengan Terbitan-Terbitan Berfluorin 1-Fenil-3-Metil-4-Benzoil-5-Pirazolona (HPMBP) Dengan Menggunakan Kaedah Pentitratan: Determination of the Stability Constants of the Complexes of Lantanides La(III), Pr(III), Eu(III), Ga(III), Er(III) and Lu(III) With Fluorinated Derivatives of 1-Phenyl-3-Methyl-4-Benzoyl-5-Pyrazolone (HPMBP) by Using Titration Method”. Journal of Science and Mathematics Letters, vol. 3, no. 2, Jan. 2019, pp. 1-10, https://ojs.upsi.edu.my/index.php/JSML/article/view/411.