IBRAHIM, Shady Ramadan. Electronic Authentication of E-commerce Contracts. Journal of Economic, Administrative and Legal Sciences, New Mexico, United States, v. 5, n. 10, p. 38–19, 2021. DOI: 10.26389/AJSRP.D171020. Disponível em: https://ajsrp.ojsexpert.com/index.php/jeals/article/view/3678. Acesso em: 20 dec. 2025.