GEORGIEVA, Slavka. Development and Challenges in Front of Clusters in Bulgaria. Vilnius University Open Series, [S. l.], p. 36–42, 2021. DOI: 10.15388/VGISC.2021.5. Disponível em: https://www.zurnalai.vu.lt/open-series/article/view/24331. Acesso em: 11 may. 2025.