@article{DAN_1984_275_4_a3,
     author = {N. V. Ivanov},
     title = {Algebraic properties of the {Teichm\"uller} modular group},
     journal = {Doklady Akademii Nauk},
     pages = {786--789},
     publisher = {mathdoc},
     volume = {275},
     number = {4},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_275_4_a3/}
}