Geodesic
Word transformations in a semigroup that is given by a system of
Algebra i logika, Tome 15 (1976) no. 6, pp. 611-621 
S. I. Adian. Word transformations in a semigroup that is given by a system of. Algebra i logika, Tome 15 (1976) no. 6, pp. 611-621. http://geodesic.mathdoc.fr/item/AL_1976_15_6_a0/
@article{AL_1976_15_6_a0,
     author = {S. I. Adian},
     title = {Word transformations in a semigroup that is given by a system of},
     journal = {Algebra i logika},
     pages = {611--621},
     year = {1976},
     volume = {15},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1976_15_6_a0/}
}
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