1. Ahonen-Myka, H. (1999). Finding all frequent maximal sequences in text. In Proceedings of the 16th international conference on machine learning ICML-99 workshop on machine learning in text data analysis (pp. 11–17). Ljubljana: J. Stefan Institute.
2. Barzilay, R., & Elhadad, M. (1997). Using lexical chains for text summarization. In Proceedings of the ACL’97/ECAL’97 workshop on intelligent scalable text summarization (pp. 10–17). Madrid, Spain.
3. Bennekom, F. C. V. (2002). Customer surveying: A guidebook for service managers. Customer Service Press.
4. Data mining techniques: For marketing, sales, and customer support;Berry,1997
5. Data warehousing, data mining, and OLAP;Berson,1997