Phong, P. Đình, N. C. Hồ, T. T. Sơn, and N. T. Thủy. “A Fuzzy Classifier Design Method Based on the Extended Hedge Algebras Quantification”. Journal of Computer Science and Cybernetics, vol. 29, no. 4, Dec. 2013, pp. 325-37, doi:10.15625/1813-9663/29/4/4340.