1. a Central Institute of Nuclear Research Rossendorf , Academy of Sciences of GDR, P.O. Box 19, DDR-8051, Dresden, GDR
2. b Joint Institute for Nuclear Research , Dubna, Head Post Office, P.O. Box 79, SU-101000, Moscow, USSR
3. c Dresden University of Technology, Department of Chemistry , Mommsenstr. 13, DDR-8027, Dresden, GDR