1. T. Connolly, C. Begg, Database Systems: A Practical Approach to Design Implementation, and Management (Addison Wesley, Essex, 2005)
2. T. Jo, Graph based KNN for optimizing index of news articles. J. Multimed. Inf. Syst. 3(3), 53–62 (2016)
3. Y. Yang, An evaluation of statistical approaches to text categorization. Inf. Retr. 1(1), 69–90 (1999)
4. F. Sebastiani, Machine learning in automated text categorization. ACM Comput. Surv. 34(1), 1–47 (2002)
5. T. Jo, Text Mining: Concepts and Big Data Challenge (Springer, Berlin, 2018)