1. Alberti, G., G. Bettinali, F. Salvetti, and S. Santoli: Proc. U. N. Intern. Conf. Peaceful Uses At. Energy, 2nd, Geneva 1958, 3, 565.
2. Ebersole, E. R., A. Harbertson, J. K. Flygare jr., and C. W. Sill: USAEC-Report, TID-7616, 147 (1962).
3. Foster, K. W.: USAEC-Report MLM-1182 (Juli 1963).
4. Furman, N. H.: Standard methods of chemical analysis. New York: D. van Nostrand Co., Inc. 1962.
5. Gunten, H. R. von, W. Buser, and F. G. Houtermans: Proc. U. N. Intern. Conf. Peaceful Uses At. Energy, 2nd, Geneva 1958, 2, 239.