1. , and , Proc. Third Internat. Conf. Luminescence Dosimetry, Risø (Denmark), Rep. No. 249, 1971 (p. 601).
2. and , Proc. 4th Internat. Symp. Exoelectron Emission and Dosimetry, Liblice (CSSR) 1973 (p. 236).
3. Hdb. anorg. Chem., Vol. 8 Al (B), 1934 (p. 353).
4. and , VIth Internat. Symp. Exoelectron Emission and Applications, Ahrenshoop (DDR) 1979, to be published.