Man Kwon, Young, Min Gu Son, Dong Keun Chung, and Myung jae Lim. 2018. “A Study on the Performance of Feature Extraction Methods According to the Size of N-Gram”. International Journal of Engineering & Technology 7 (3.33): 23-27. https://doi.org/10.14419/ijet.v7i3.33.18516.