1. Chang Y, Hwang H, and Son W (2020). Unstructured Data Analysis, KNOU Press, Seoul.
2. Feature selection for text classification with Naïve Bayes
3. Forman G (2003). An extensive empirical study of feature selection metrics for text classification, Journal of Machine Learning Research, 3, 1289-1305.
4. Feature selection for text data via topic modeling
5. Jeong HY, Shin SM, and Choi YS (2019). Comparison of term weighting schemes for document classification, The Korean Journal of Applied Statistics, 32, 265-276.