@article{IM2_1975_9_4_a0,
     author = {I. V. Andozhskii},
     title = {On some classes of closed pro-$p$-groups},
     journal = {Izvestiya. Mathematics},
     pages = {663--691},
     year = {1975},
     volume = {9},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1975_9_4_a0/}
}