@article{IVM_2010_1_a6,
     author = {I. V. Petrov},
     title = {The mirror image of the language of 2-synchronizing words},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {69--73},
     year = {2010},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2010_1_a6/}
}