ZHANG, L.; ZHANG, Y. Protection in DRM and pricing strategies for digital products considering quality degradation. Economic Analysis Letters, [S. l.], v. 2, n. 1, p. 18–22, 2023. DOI: 10.58567/eal02010003. Disponível em: https://anser.press/index.php/eal/article/view/196. Acesso em: 3 may. 2024.