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Aleksandr N. Ponomarenko
Institute of Geochemistry, Mineralogy and Ore Formation M.P.Semenenko, NAS of Ukraine Director of Institute, Corresponding member NAS of Ukraine, 34, Palladina av., Kiev-142, 03680 Ukraine
Stepan G. Kryvdik
Institute of Geochemistry, Mineralogy and Ore Formation M.P.Semenenko, NAS of Ukraine Senior Research Scientist, Candidate of science, 34, Palladina av., Kiev-142, 03680 Ukraine
Aleksandr V. Grinchenko
Taras Shevchenko National University of Kyiv, Geological faculty Docent, Candidate of science, 90 Vasyl'kivska str., Kyiv 03022 Ukraine