@article{IM2_1986_27_3_a8,
     author = {I. V. Andozhskii and V. M. Tsvetkov},
     title = {Analytic pro-$p$-groups of rank~$3$ and closed pro-$p$-groups of type~$(3,4)$},
     journal = {Izvestiya. Mathematics},
     pages = {593--599},
     year = {1986},
     volume = {27},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1986_27_3_a8/}
}