1. W. MULLER, J. REUL and K. BUIJS, to be published
2. J.P. CHARVILLAT, U. BENEDICT, D. DAMIEN and W. MULLER, submitted for publication to Radiochem. and Radioanalyt. Letters
3. Americium disulfide and diselenide
4. P. MERIEL, J. ROCHE and J. RABOT, private communication