Cường, Bùi Công, Hoàng Việt long, and Phạm Hồng Phong. “On the Approximation of Continous Function by Spline Function Hireachical Fuzzy Systems”. Journal of Computer Science and Cybernetics 25, no. 2 (April 27, 2012): 99–108. Accessed December 5, 2025. https://vjs.ac.vn/jcc/article/view/563.