Normal congruence subgroups of the $t \times t$ modular group
Newman, M.
Bull. Amer. Math. Soc., Tome 69 (1963) no. 4, p. 719-720 / Harvested from Project Euclid
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Publié le : 1963-09-15
Classification:  
@article{1183525464,
     author = {Newman, M.},
     title = {Normal congruence subgroups of the $t \times t$ modular group},
     journal = {Bull. Amer. Math. Soc.},
     volume = {69},
     number = {4},
     year = {1963},
     pages = { 719-720},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183525464}
}

Newman, M. Normal congruence subgroups of the $t \times t$ modular group. Bull. Amer. Math. Soc., Tome 69 (1963) no. 4, pp.  719-720. http://gdmltest.u-ga.fr/item/1183525464/