BOYANOV, P. Content of vol. 4, 2013: Content of vol. 4, 2013. JOURNAL SCIENTIFIC AND APPLIED RESEARCH, [S. l.], v. 4, n. 1, p. 3–5, 2023. DOI: 10.46687/jsar.v4i1.74. Disponível em: https://jsar.ftn.shu.bg/index.php/jsar/article/view/74. Acesso em: 22 dec. 2024.