Hydrothermal uranium-base metal mineralization of the Jánská vein, Březové Hory, Příbram, Czech Republic: lead isotopes and chemical dating of uraninite - Škácha, Pavel; Goliáš, Viktor; Sejkora, Jiří; Plášil, Jakub; Strnad, Ladislav; Škoda, Radek; Ježek, Josef (Journal of Geosciences, 2009)