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@article{10_4064_aa_33_3_261_267, author = {Juliet Britto}, title = {On the construction of non-congruence subgroups}, journal = {Acta Arithmetica}, pages = {261--267}, publisher = {mathdoc}, volume = {33}, number = {3}, year = {1977}, doi = {10.4064/aa-33-3-261-267}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-33-3-261-267/} }
Juliet Britto. On the construction of non-congruence subgroups. Acta Arithmetica, Tome 33 (1977) no. 3, pp. 261-267. doi : 10.4064/aa-33-3-261-267. http://geodesic.mathdoc.fr/articles/10.4064/aa-33-3-261-267/
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