@article{IM_1989__98_1_143743,
     author = {W. Soergel},
     title = {n-Cohomology of simple highest weight modules on walls and purity.},
     journal = {Inventiones mathematicae},
     pages = {565--580},
     year = {1989},
     volume = {98},
     number = {1},
     zbl = {0781.22011},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__98_1_143743/}
}