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@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/} }
L. A. Gutnik; I. I. Pyatetskiǐ-Šapiro. Maximal discrete subgroups of a~unimodular group. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 15 (1966), pp. 279-295. http://geodesic.mathdoc.fr/item/MMO_1966_15_a7/