Ognyan Petrov

Geological Institute, Bulgarian Academy of Sciences, Sofia 1113, Acad. G. Bonchev St., Block 24, Sofia 1113, Bulgaria
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Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Block 107, Sofia 1113, Bulgaria
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Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Block 107, Sofia 1113, Bulgaria

Volume 40 1-3 December 2011