Maria Cieslak-Golonka is associate professor of chemistry at the Institute of Inorganic Chemistry and Metallurgy of Rare Elements at the University of Technology in Wroclaw, Poland. Address: Institute of Inorganic Chemistry and Metallurgy of Rare Elements, University of Technology, 50-370, Wroclaw, Poland: Internet: golonka@ichn.ch.pwr.wroc.pl