Fredy Gavilanes-Sagnay, Edison Loza-Aguirre, Byron Ernesto Vaca Barahona, Henry N. Roa (2023) “A Systematic Review of Ill-Defined Problems in the Intelligent Tutoring Systems in Virtual Learning Environments”, International Journal of Intelligent Systems and Applications in Engineering, 11(5s), pp. 220 –. Available at: https://ijisae.org/index.php/IJISAE/article/view/2769 (Accessed: 14 May 2024).