@article{IM_1987__87_143423,
     author = {A. Ramanathan and G.R. Kempf},
     title = {Multi-cones over {Schubert} varieties},
     journal = {Inventiones mathematicae},
     pages = {353--364},
     publisher = {mathdoc},
     volume = {87},
     year = {1987},
     zbl = {0615.14028},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__87_143423/}
}