1. Faculty of Chemistry; Moscow State University; Leninskie Gory Moscow 119991 Russia
2. Chemistry department, Institute of Physics, The Czech Academy of Sciences; Na Slovance 1999/2, 182 21 Prague 8 Czech Republic
3. Laboratory of Dielectrics and Magnetics, Chemistry Department; Warsaw University; Al. Zwirki I Wigury 101 Warsaw 02-089 Poland