Hamzah, B. (2018) “Mercury(II) extraction from solution with W/O type of liquid membrane emulsion using surfactant combination (span-80 + span-20) and 1-phenyl-3-methyl-4- benzoyl-5 -pyrazolone as carrier of cation”, International Journal of Engineering & Technology, 7(4), pp. 4278–4281. doi:10.14419/ijet.v7i4.17440.