Bui, Hieu Trong, and Syed Malek F D Syed Mustapha. 2018. “Automated Data-Driven Hint Generation in Intelligent Tutoring Systems for Code-Writing: On the Road of Future Research”. International Journal of Emerging Technologies in Learning (iJET) 13 (09):pp. 174-189. https://doi.org/10.3991/ijet.v13i09.8023.