1. C. H. MATHEWSON, in: Zinc, The Science and Technology of the Metal, Its Alloys and Compounds, C. H. Mathewson Ed., Reinhold Publishing Corporation, New York, 1959, p. 386.
2. N. DE BRUCKER, K. STRIJCKMANS, C. VANDECASTEELE, Anal. Chim. Acta, 195 (1987) 323.
3. N. DE BRUCKER, J. DEWAELE, K. STRIJCKMANS, C. VANDECASTEELE, Anal. Chim. Acta, 220 (1988) 93.
4. L. A. CURRIE, Anal. Chem., 40 (1968) 486.
5. K. A. KRAUS, F. NELSON, in: Ion Exchange Chromatography, H. F. WALTON (ed.), Dowden, Hutchinson & Ross, Stroudsburg, 1976, p. 161.