@article{JRAM_1993__439_153528,
     author = {Jianbei An},
     title = {2-weigths for classical groups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {159--204},
     year = {1993},
     volume = {439},
     zbl = {0769.20016},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1993__439_153528/}
}