@article{MMO_1966_15_a7,
     author = {L. A. Gutnik and I. I. Pyatetskiǐ-\v{S}apiro},
     title = {Maximal discrete subgroups of a~unimodular group},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {279--295},
     publisher = {mathdoc},
     volume = {15},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1966_15_a7/}
}