Geodesic
On A characteristic of congruence subgroups of the group $G=SL(2,\mathbb{Z})$
Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 2, pp. 89-90.

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D. A. Kazhdan. On A characteristic of congruence subgroups of the group $G=SL(2,\mathbb{Z})$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 2, pp. 89-90. http://geodesic.mathdoc.fr/item/FAA_1970_4_2_a14/

[1] Menicke I., Invent. Math., 4 (1967), 202–228 | DOI | MR

[2] Moore C., Publ. Math. IHES, 35 (1968) | DOI | Zbl