@article{MZM_2000_67_3_a15,
     author = {Yu. G. Leonov},
     title = {On a~lower bound for the growth function of the {Grigorchuk} group},
     journal = {Matemati\v{c}eskie zametki},
     pages = {475--477},
     publisher = {mathdoc},
     volume = {67},
     number = {3},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2000_67_3_a15/}
}