@article{DAN_1971_200_3_a6,
     author = {V. P. Platonov},
     title = {On the maximality problem for arithmetic groups},
     journal = {Doklady Akademii Nauk},
     pages = {530--533},
     publisher = {mathdoc},
     volume = {200},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_3_a6/}
}