Bui, P. U., Duong, H. T., Ha, H. Q. T., & Nguyen, Q. K. (2018). Solving a mathematical problem in different ways: A case of calculating the distance from a point to a plane. CTU Journal of Innovation and Sustainable Development , 54(10), 54-62. https://doi.org/10.22144/ctu.jen.2018.038