RESEARCH FOCUS INTERNATIONAL SCIENTIFIC JOURNAL. Research Focus International Scientific Journal . Research Focus International Scientific Journal, [S. l.], v. 2, n. 2, p. 1–253, 2023. DOI: 10.66073/10.66073. Disponível em: https://refocus.uz/index.php/1/article/view/33. Acesso em: 10 jun. 2026.