@article{DAN_1970_192_4_a7,
     author = {G. A. Margulis},
     title = {The isometry of closed manifolds of constant negative curvature with the same fundamental group},
     journal = {Doklady Akademii Nauk},
     pages = {736--737},
     publisher = {mathdoc},
     volume = {192},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_4_a7/}
}