L. Tikhomirova

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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lnstitllle for Geology and Mineral Exploration ( lGME), 11527 Athens
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Vsesoyuzniy Geologicheskiy lnstitut ( VSEGEI), 199026 Leningrad
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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lnstitllle for Geology and Mineral Exploration ( lGME), 11527 Athens
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lnstitllle for Geology and Mineral Exploration ( lGME), 11527 Athens

Volume 19 5 October 1989

Vsesoyuznyi Geologicheskyi lnstitul ( VSEGE!), 199026 Leningrad

Volume 19 5 October 1989

VSEGEI, 199026 Leningrad
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Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia

Volume 19 2 April 1989

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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Volume 18 6 December 1988