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- 2022 ,no. 3-4. Izvestiya : Journal of Varna University of Economics. Varna : University of Economics Varna, 2022. ISSN 2367-6361 [Copy count : 1, currently available 0, at library only 1]
- 2022 ,no. 1-2. Izvestiya : Journal of Varna University of Economics. Varna : University of Economics Varna, 2022. ISSN 2367-6361 [Copy count : 1, currently available 0, at library only 1]