Analysis and testing of the most important factors affecting (COVID-19). Periodicals of Engineering and Natural Sciences, [S. l.], v. 9, n. 1, p. 3–10, 2021. DOI: 10.21533/pen.v9.i1.707. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/707. Acesso em: 30 may. 2026.