Geodesic
Free quotients of congruence subgroups of Bianchi groups.
Mathematische Annalen, Tome 293 (1992) no. 4, pp. 65-76 Cet article a éte moissonné depuis la source European Digital Mathematics Library

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Mots-clés : Dedekind ring of arithmetic type, subgroup of finite index, ring of integers, imaginary quadratic number field, coordinate ring, affine curve, projective curve, finite field, congruence subgroups, elementary matrices, principal congruence subgroup, Bianchi groups, free quotient, noncongruence cracks, standard subgroups 
@article{MAN_1992__293_4_164945,
     author = {A.W. Mason},
     title = {Free quotients of congruence subgroups of {Bianchi} groups.},
     journal = {Mathematische Annalen},
     pages = {65--76},
     year = {1992},
     volume = {293},
     number = {4},
     zbl = {0734.20021},
     url = {http://geodesic.mathdoc.fr/item/MAN_1992__293_4_164945/}
}
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A.W. Mason. Free quotients of congruence subgroups of Bianchi groups.. Mathematische Annalen, Tome 293 (1992) no. 4, pp. 65-76. http://geodesic.mathdoc.fr/item/MAN_1992__293_4_164945/