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Hannover: Gottfried Wilhelm Leibniz Universität Hannover, 2022 ; Hannover: Technische Informationsbibliothek (TIB), 2022
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Amsterdam [u.a.] : Elsevier, 2022
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Sofia : Pensoft Publishers, 2018
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Pensoft Publishers, 2021
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Walter de Gruyter GmbH, 2018
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MDPI AG, 2021
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Pensoft Publishers, 2021
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New Bulgarian University, 2021
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MDPI AG, 2024
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Pensoft Publishers, 2023
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Pensoft Publishers, 2021
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Pensoft Publishers, 2018
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Pensoft Publishers, 2017
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European Center of Sustainable Development, 2016
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Pensoft Publishers, 2021
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Pensoft Publishers, 2018
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European Center of Sustainable Development, 2016
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Elsevier BV, 2024
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Pensoft Publishers, 2017
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MDPI AG, 2021