@article{MZM_1974_16_5_a4,
     author = {V. G. Durnev},
     title = {On equations in free semigroups and groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {717--724},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_5_a4/}
}