1. International Atomic Energy, The Principles of Radioactive Waste Management, Safety Series, no. 111-F, Vienna, 1995.
2. A.I. Busev; V.G. Tiptsova, and V.M. Ivanov, Analytical Chemistry. of Rare Elements, Mir Publishers, Moscow, 1981.
3. S. Palágyl and T. Braun, Separation and preconcentration of trace elements and inorganic species on solid polyurethane foam sorbents, in: Z.B. Alfassi and C.M. Wai (Eds.), Preconcentration Techniques for Trace Elements, CRC Press, Boca Raton, FL, 1992.
4. T. Braun, J.D. Navratil and A.B. Farag, Polyurethane Foam Sorbents in Separation Science, CRC Press, Boca Raton, FL, 1985.
5. Direct determination of gallium on polyurethane foam by X-ray fluoresce;Carvalho;Talanta,1995