@article{GDZPPN002098008,
title = {Spherical Functions and a q-Analogue of Kostant's Weight Multiplicity Formula.},
journal = {Inventiones mathematicae},
volume = {69},
year = {1982},
pages = {461-468},
zbl = {0498.17005},
url = {http://dml.mathdoc.fr/item/GDZPPN002098008}
}
Kato, Shin-ichi. Spherical Functions and a q-Analogue of Kostant's Weight Multiplicity Formula.. Inventiones mathematicae, Tome 69 (1982) pp. 461-468. http://gdmltest.u-ga.fr/item/GDZPPN002098008/