Zolfonoun, E. “Dispersive Liquid–liquid Microextraction Technique Combined With UV–Vis Spectrophotometry for Determination of Zirconium in Aqueous Samples”. Analytical Methods in Environmental Chemistry Journal, Vol. 3, no. 03, Sept. 2020, pp. 18-24, doi:10.24200/amecj.v3.i03.107.