@article{IM_1992__107_1_143974,
     author = {Uwe Jannsen},
     title = {Motives, numerical equivalence, and semi-simplicity.},
     journal = {Inventiones mathematicae},
     pages = {447--452},
     publisher = {mathdoc},
     volume = {107},
     number = {1},
     year = {1992},
     zbl = {0762.14003},
     url = {http://geodesic.mathdoc.fr/item/IM_1992__107_1_143974/}
}