Institution: | 1. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia 2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Moscow, Russia 3. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia
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