Lee, M.-C., Chang, J.-W., Wang, T. I., & Huang, Z. F. (2020). Using Variation Theory as a Guiding Principle in an OOP Assisted Syntax Correction Learning System. International Journal of Emerging Technologies in Learning (iJET), 15(14), pp. 35–52. https://doi.org/10.3991/ijet.v15i14.14191