Zheng, Yan. “Design of a Blockchain-Based E-Portfolio Evaluation System to Assess the Education and Teaching Process”. International Journal of Emerging Technologies in Learning (iJET) 16, no. 05 (March 16, 2021): pp. 261–280. Accessed November 22, 2024. https://online-journals.org/index.php/i-jet/article/view/21081.