JÚNIOR, Demétrio Mendonça; DALLAGNOL, Mathäus Freitag; MARTINS, Vanessa Quadros; FREITAG, Viviane Costa. Evaluation of E-Commerce Systems: Comparative Study Before and During the COVID-19 Pandemic. Journal of Information Systems and Technology Management, [S. l.], v. 20, p. e202320002, 2023. DOI: 10.4301/S1807-1775202320002. Disponível em: https://jistem.tecsi.org/index.php/jistem/article/view/3182. Acesso em: 15 aug. 2025.