Boris Valchev

University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia, e-mail: b_valchev@mgu.bg

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University of Mining and Geology “St Ivan Rilski”, Department of Geology and Geoinformatics, 1 Prof. Boyan Kamenov Str., Studentski Grad, 1700 Sofia, Bulgaria
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Sofia University “St Kliment Ohridski”, Department of Geology, Palaeontology and Fossil Fuels, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria

Volume 47 1 May 2018

Geological Institute of the Bulgarian Academy of Sciences, 1113 Sofia
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University of Mining and Geology “St. Ivan Rilski”, Studentski Grad, 1700 Sofia

Volume 36 1-2 June 2007

University of Mining and Geology “St. Ivan Rilski”, Studentski Grad, 1700 Sofia

Volume 35 3-4 December 2006