@article{MZM_1987_41_3_a15,
     author = {S. I. Adian and G. U. Oganesyan},
     title = {Problems of equality and divisibility in semigroups with a single defining relation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {412--421},
     publisher = {mathdoc},
     volume = {41},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_3_a15/}
}