A. Mirabi, M. Jamali, P. Mehraeen, and K. Berijani, “Determination of Trace Amounts of Nickel in Food and Environmental Water Samples by Flame Atomic Absorption Spectrometry after Dispersive Liquid-Liquid Microextraction”, ajc, vol. 24, no. 8, pp. 3425–3429, Apr. 2012.