Editorial. REVISTA DE INVESTIGACIÓN SIGMA, [S. l.], v. 8, n. 01, p. 1–8, 2021. DOI: 10.24133/sigma.v8i01.1846. Disponível em: https://journal.espe.edu.ec/ojs/index.php/Sigma/article/view/1846.. Acesso em: 3 jul. 2024.