Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1986__191_173654, author = {F. Rudolf Beyl}, title = {The {Schur} {Multiplicator} of {SL(2,} {Z/mZ)} and the {Congruence} {Subgroup} {Property.}}, journal = {Mathematische Zeitschrift}, pages = {23--42}, publisher = {mathdoc}, volume = {191}, year = {1986}, zbl = {0581.20050}, url = {http://geodesic.mathdoc.fr/item/MZ_1986__191_173654/} }
F. Rudolf Beyl. The Schur Multiplicator of SL(2, Z/mZ) and the Congruence Subgroup Property.. Mathematische Zeitschrift, Tome 191 (1986), pp. 23-42. http://geodesic.mathdoc.fr/item/MZ_1986__191_173654/