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Vol. 21 (5)/October 1991 - p. 99

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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Vol. 39 (1-2)/September 2010 - pp. 31-32

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Bulgarian Academy of Sciences, Institute of Physical Chemistry, Bulgaria

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Institute of Isotope Geochemistry and Mineral Resources, ETH Zurich, Switzerland

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Bulgarian Academy of Sciences, Geological Institute, Bulgaria

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Bulgarian Academy of Sciences, Central laboratory of Mineralogy and Crystallography, Bulgaria

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Sofia University, Department of Mineralogy, Petrology, Ores and Minerals, Bulgaria

Vol. 46 (1)/July 2017 - pp. 3-25

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Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria

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