@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},
     publisher = {mathdoc},
     volume = {15},
     number = {6},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1976_15_6_a0/}
}