How universities have responded to E-learning as a result of Covid-19 challenges. Periodicals of Engineering and Natural Sciences, [S. l.], v. 10, n. 3, p. 40–47, 2022. DOI: 10.21533/pen.v10.i3.641. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/641. Acesso em: 27 jun. 2026.