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[S.l.]: SSRN, [2020]
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[S.l.]: SSRN, [2016]
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[S.l.]: SSRN, [2015]
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[S.l.]: SSRN, 2016
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[S.l.]: SSRN, [2015]
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[S.l.]: SSRN, [2016]
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[S.l.]: SSRN, [2016]
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[S.l.]: SSRN, [2015]
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Economic Research Institute at the Bulgarian Academy of Sciences, 2015
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EDP Sciences, 2022
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Economic Research Institute at the Bulgarian Academy of Sciences, 2022
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Agricultural University, 2023