Paraskev Petrov

Sofia University "St. Kliment Ohridski", 1000 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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Sofia University "St. Kliment Ohridski", 1000 Sofia, Bulgaria
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Sofia University "St. Kliment Ohridski", 1000 Sofia, Bulgaria

Volume 26 1 March 1996