1. Speech recognition: Theory and C++ implementation;Becchetti,1999
2. Using Kullback–Leibler distance for text categorization;Bilgi,2003
3. Boehm, B. W, Brown, J. R, Kaspar, H., Lipow, M., Macleod, G., & Merritt, M. J. (1973). Characteristics of Software Quality, TRW Software Series TRW-SS-73-09.
4. Brill, E., & Moore, R. C. (2002). An improved error model for noisy channel spelling correction. In Proceedings of ACL-2000, the 38th annual meeting of the association for computational linguistics (pp. 286–293).
5. Census Bureau Home Page (1990). .