Bui, H. T., & F D Syed Mustapha, S. M. (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