@article{10_1090_S0894_0347_1993_99999_X,
     author = {Kazhdan, D. and Lusztig, G.},
     title = {Tensor structures arising from affine {Lie} algebras. {I}},
     journal = {Journal of the American Mathematical Society},
     pages = {905--947},
     publisher = {mathdoc},
     volume = {06},
     number = {4},
     year = {1993},
     doi = {10.1090/S0894-0347-1993-99999-X},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1993-99999-X/}
}