BOYANOV, P.; BOYANOV, P. Content of vol. 3, 2013: Content of vol. 3, 2013. JOURNAL SCIENTIFIC AND APPLIED RESEARCH, [S. l.], v. 3, n. 1, p. 3–4, 2023. DOI: 10.46687/jsar.v3i1.54. Disponível em: https://jsar.ftn.shu.bg/ojs-3.3.0-7/index.php/jsar/article/view/54. Acesso em: 7 nov. 2024.