@article{ZNSL_1976_57_a10,
     author = {V. M. Tsvetkov},
     title = {A~comment on pro-$p$-groups of cohomological dimention~2},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {170},
     publisher = {mathdoc},
     volume = {57},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_57_a10/}
}