@article{ZNSL_1976_64_a4,
     author = {N. A. Vavilov},
     title = {Parabolic congruence subgroups in linear groups},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {55--63},
     publisher = {mathdoc},
     volume = {64},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_64_a4/}
}