Rumyana Arnaudova

Geological institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
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Geological institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
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Geological institute, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria
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University of Mining and Geology "Sv. Ivan Rilski", 1700, Sofia

Volume 32 2-4 December 2002

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

Volume 23 4 August 1993