Geodesic
The problem of equality of words for certain classes of
Algebra i logika, Tome 5 (1966) no. 5, pp. 25-35 
Yu. Sh. Gurevich. The problem of equality of words for certain classes of. Algebra i logika, Tome 5 (1966) no. 5, pp. 25-35. http://geodesic.mathdoc.fr/item/AL_1966_5_5_a1/
@article{AL_1966_5_5_a1,
     author = {Yu. Sh. Gurevich},
     title = {The problem of equality of words for certain classes of},
     journal = {Algebra i logika},
     pages = {25--35},
     year = {1966},
     volume = {5},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1966_5_5_a1/}
}
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