@article{IM2_1990_34_1_a4,
     author = {O. V. Mel'nikov},
     title = {Subgroups and homology of free products of profinite groups},
     journal = {Izvestiya. Mathematics},
     pages = {97--119},
     year = {1990},
     volume = {34},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_34_1_a4/}
}