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@article{MAN_1974__212_182733, author = {Wilberd van der Kallen}, title = {The {Schur} {Multipliers} of {SL} (3, {Z)} and {&L} (4, {Z).}}, journal = {Mathematische Annalen}, pages = {47--50}, publisher = {mathdoc}, volume = {212}, year = {1974}, zbl = {0295.20052}, url = {http://geodesic.mathdoc.fr/item/MAN_1974__212_182733/} }
Wilberd van der Kallen. The Schur Multipliers of SL (3, Z) and &L (4, Z).. Mathematische Annalen, Tome 212 (1974), pp. 47-50. http://geodesic.mathdoc.fr/item/MAN_1974__212_182733/