Geodesic
On transformations of a set of words in a finite alphabet that do not propagate distortions
Diskretnaya Matematika, Tome 9 (1997) no. 3, pp. 3-19.

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We consider the mappings of a set of words into itself, and describe the injective mappings which do not propagate such errors as alteration of letters in words, the bijective mappings which do not propagate such errors as deletion of letters, and the injective mappings which do not propagate the errors of the above two types. 
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A. V. Babash; M. M. Glukhov; G. P. Shankin. On transformations of a set of words in a finite alphabet that do not propagate distortions. Diskretnaya Matematika, Tome 9 (1997) no. 3, pp. 3-19. http://geodesic.mathdoc.fr/item/DM_1997_9_3_a0/