@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/}
}