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Sofia: Bulgarian Bestseller Company, [2004]
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Sofia, 1951
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2016
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Springer Science and Business Media LLC, 2015
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OpenEdition, 2016
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Institut Za Noviju Istoriju Srbije, 2023
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Centre for Evaluation in Education and Science (CEON/CEES), 2023
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2023
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National Library of Serbia, 2022
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MDPI AG, 2018
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EJournal Publishing, 2016
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Pleiades Publishing Ltd, 2014
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University of Debrecen/ Debreceni Egyetem, 2011
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National Library of Serbia, 2010
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University of Debrecen/ Debreceni Egyetem, 2010
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Geological Institute, Bulgarian Academy of Sciences, 1991
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OOO Centr naucnyh i obrazovatelnyh proektov, 2019
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Pleiades Publishing Ltd, 2014
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Springer Science and Business Media LLC, 2004