M. Shabany, A. M. H. Shabani, S. Dadfarnia, A. Gorji, and S. H. Ahmadi, “Solid phase extraction of zinc with octadecyl silica membrane disks modified by N,N’-disalicylidene-1,2-phenylendiamine and determination by flame atomic absorption spectrometry”, Eclet. Quim., vol. 33, no. 2, pp. 61–66, Jun. 2008.