1. Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
2. European Commission, Joint Research Centre, Institute for Transuranium Elements Postfach 2340, 76125 Karlsruhe, Germany
3. Charles University, Faculty of Mathematics and Physics, Department of Electronic Structures, Ke Karlovu 5, 12116 Prague 2, The Czech Republic