@article{MZM_1982_31_3_a1,
     author = {O. V. Mel'nikov},
     title = {Characteristic subgroups and automorphisms of free profinite groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {339--349},
     year = {1982},
     volume = {31},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1982_31_3_a1/}
}