@article{GDZPPN00210363X,
title = {Multi-cones over Schubert varieties},
journal = {Inventiones mathematicae},
volume = {88},
year = {1987},
pages = {353-364},
zbl = {0615.14028},
url = {http://dml.mathdoc.fr/item/GDZPPN00210363X}
}
Ramanathan, A.; Kempf, G.R. Multi-cones over Schubert varieties. Inventiones mathematicae, Tome 88 (1987) pp. 353-364. http://gdmltest.u-ga.fr/item/GDZPPN00210363X/