L. Asmar, K. . Grigoryan, C. Y. Low, D. . Roeltgen, A. . Kühn, and R. . Dumitrescu, “Structuring Framework for Early Validation of Product Ideas”, IJIE, vol. 13, no. 2, pp. 229–240, Dec. 2020, Accessed: Apr. 07, 2026. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/7648