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Copyright responsibility: Nikolai Stoenchev, Ivelina Shopova
Source: Управление и устойчиво развитие
Year published: 2015
Volume: 2, 51
Pages: с. 31-35
ID: LTU090049592
Copyright responsibility: Nikolai Stoenchev, Nikolai Bardarov
Source: Управление и устойчиво развитие
Year published: 2016
Volume: 2, 57
Pages: pg. 67-70
ID: LTU090050734
Pages:
