1. Huygens-Kamerlingh
Onnes Laboratory, Department of Physics, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
2. Department
of Chemistry, Kyiv National Taras Shevchenko University, 01601 Kyiv, Ukraine
3. Vernadskii Institute
of General and Inorganic Chemistry of the National Academy of Sciences
of Ukraine, 03680 Kyiv, Ukraine
4. Nesmeyanov Institute
of Organoelement Compounds of the Russian Academy of Sciences, 119991 Moscow, Russian Federation