@article{10_1090_S0894_0347_1989_0991016_9,
     author = {Lusztig, George},
     title = {Affine {Hecke} algebras and their graded version},
     journal = {Journal of the American Mathematical Society},
     pages = {599--635},
     year = {1989},
     volume = {02},
     number = {3},
     doi = {10.1090/S0894-0347-1989-0991016-9},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-1989-0991016-9/}
}