Dimitar Sachkov

Elitsa Zareva

University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria

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Valeri Sachanski

University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria; Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

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Lubomir Metodiev

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

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Boris Valchev

University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria

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Dimitar Sachkov

University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria

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Miroslav Slavchev

University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria

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Daniel Yanev

University of Mining and Geology, Studentski Grad, Prof. Boyan Kamenov Str., 1700 Sofia, Bulgaria