@article{MZM_1985_38_4_a2,
     author = {I. G. Lysenok},
     title = {A system of defining relations for a {Grigorchuk} group},
     journal = {Matemati\v{c}eskie zametki},
     pages = {503--516},
     publisher = {mathdoc},
     volume = {38},
     number = {4},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_38_4_a2/}
}