@article{10_1090_S0894_0347_1994_1239507_1,
     author = {Kazhdan, D. and Lusztig, G.},
     title = {Tensor structures arising from affine {Lie} algebras. {IV}},
     journal = {Journal of the American Mathematical Society},
     pages = {383--453},
     publisher = {mathdoc},
     volume = {07},
     number = {2},
     year = {1994},
     doi = {10.1090/S0894-0347-1994-1239507-1},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1994-1239507-1/}
}