1. Max-Planck Institut für Eisenforschung GmbH, Max-Planck Strasse 1,
40237 Düsseldorf, Germany
2. Physics Department, Lomonosov Moscow State University, Leninskie gory,
1, build. 2., 119991 Moscow, Russia
3. Topchiev Institute of Petrochemical
Synthesis, Russian Academy of Sciences,
Leninsky prosp. 29, 119991 Moscow, Russia