Geodesic
Free Quotients of Congruence Subgroups of SL2 Over a Coordinate Ring.
Mathematische Zeitschrift, Tome 198 (1988) no. 3, pp. 39-52.

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Mots-clés : q-elementary matrices, coordinate ring of affine curve, free product, principal congruence subgroup, free group, standard subgroups, free quotients 
@article{MZ_1988__198_3_173908,
     author = {A.W. Mason},
     title = {Free {Quotients} of {Congruence} {Subgroups} of {SL2} {Over} a {Coordinate} {Ring.}},
     journal = {Mathematische Zeitschrift},
     pages = {39--52},
     publisher = {mathdoc},
     volume = {198},
     number = {3},
     year = {1988},
     zbl = {0619.20031},
     url = {http://geodesic.mathdoc.fr/item/MZ_1988__198_3_173908/}
}
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A.W. Mason. Free Quotients of Congruence Subgroups of SL2 Over a Coordinate Ring.. Mathematische Zeitschrift, Tome 198 (1988) no. 3, pp. 39-52. http://geodesic.mathdoc.fr/item/MZ_1988__198_3_173908/