@article{AA_2008_20_4_a5,
     author = {V. Petrov and A. Stavrova},
     title = {Elementary subgroups of isotropic reductive groups},
     journal = {Algebra i analiz},
     pages = {160--188},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2008_20_4_a5/}
}