1. Geckeler, K. E. and Rongnong, Z., Ger. Offen. DE 4227019 (Cl. C08F8/00), 1994; Chem. Abstr., 1994, 121, 10302f
2. Separation and determination of trace amounts of zinc and cadmium by on-line enrichment in flow injection flame atomic absorption spectrometry
3. Albert, E., in Selective Toxicity. Chapman and Hall, London, 1979
4. Manolova, N., Rashkov, I., Panayotov, I. and Buchvarov, N., Bulgarian Patent 43772, Reg. No. 79270, 1987