BOYANOV, P. Content of vol. 21, 2021, Journal Scientific and Applied Research: Content of vol. 21, 2021, Journal Scientific and Applied Research. JOURNAL SCIENTIFIC AND APPLIED RESEARCH, [S. l.], v. 21, n. 1, p. 3, 2023. DOI: 10.46687/jsar.v21i1.311. Disponível em: https://jsar.ftn.shu.bg/index.php/jsar/article/view/311. Acesso em: 22 dec. 2024.