1. Bleyl, H. J. and Ochsenfeld, W. 1978.Chemistry of Radioactive Waste Disposal, 34München: Karl Thiemig. Part II
2. Wagner, W. and Ochsenfeld, W. 1981.Nuclear Fuel Cycle, Vol. 1, 109Weinheim, Deerfield Beach, Florida: Chemie.
3. Petrich, G. and Schmieder, H. 1983. Int. Solvent Extraction Conf. Aug.26 - Sept. 21983, Denver, Colorado, USA. Paper No. 10 n
4. Joseph, C. J., Detilleux, E., Centeno, J., Eschrich, H., Schneider, E. and van Geel, J. 1971. Proc. of the 4. United Nations Int. Conf. on the Peaceful Uses of Atomic Energy. Sept.6 - 161971, Geneva. Vol. 8, pp.349