1. P. Norvig, How to Write a Spelling Corrector, http://norvig.com/spell-correct.html.
2. Church, Probability scoring for spelling correction;Kenneth W;Statistics and Computing,1991
3. Computer programs for detecting and correcting spelling errors;Peterson;Communications of the A.C.M.,1980
4. J. L. Peterson, Computer programs for spelling correction: an experiment in program design, Springer-Verlag.
5. Spelling correction for the telecommunications network for the deaf;Kukich;Communications of the A.C.M.,1992