@article{FAA_1968_2_1_a2,
     author = {D. A. Kazhdan},
     title = {The structure of $\Gamma$-rational groups for some discrete subgroup $\Gamma$ of the group $SL(2,\mathbb{R})$},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {36--39},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1968_2_1_a2/}
}