3Graesser A. C., Wiemer-Hastings K., Wiemer - Hastings P., et al.. AutoTutor: A Simulation of A Human Tutor[J]. Journal of Cognitive Systems Research , 1999, 1 : 35 - 51.
4Hu, X., Cai, Z., Louwerse, M., et al.. A Revised Algorithm for Latent Semantic Analysis [A]. In: Proceedings of the 2003 International Joint Conference on Artificial Intelligenee [C], 2003, 1489- 1491.
5Cai, Z., McNamara, D. S. , Louwerse, M. M., Hu, X., Rowe, M. , & Graesser, A. C. (2004). NLS: A Non-Latent Similarity Algorithm [A]. K. Forbus, D. Gentner, & T. Reiger. Proceedings of the 26th Annual Meeting of the Cognitive Science Society [C]. NJ: Erlbaum, 2004, 180- 185.
6Preslav Nakov, Antonia Popova, Plamen Mateev. Weight Functions Impact on LSA Performance[A]. In: Proceeding of EuroConference RANLP' 2001 [ C ]. Tzigov Chark, Bulgaria, 187- 193.
7Hu, X., Cai, Z., Franeeschetti, D., et al.. LSA: The First Dimension and Dimensional Weighting [A]. R. Alterman and D. Hirsh. Proceedings of the 25th Annual Conference of the Cognitive Science Society [C]. Boston,MA: Cognitive Science Society, 2003, 1 - 6.
8Salton G, Wong A, Yang C S. A vector space model for automatic indexing. Communications of the ACM, 1975, 18(11): 613 - 620.
9Sebastiani F. Machine learning in automated text categorization.ACM Computing Surveys, 2002, 34(1):1-47.
10Riloff E, Lehnert W. Information extraction as a basis for high-precision text classification. ACM Trans on Information Systems, 1994, 12(3): 296 - 333.