Dimiter Tronkov

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Sofia University "St. Kliment Ohridski" 15 Tsar Osvoboditel Blvd., 1504 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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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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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

Volume 28 3-4 December 1998

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

Volume 28 3-4 December 1998

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Volume 23 5 October 1993

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

Volume 22 6 December 1992