@article{GDZPPN002338769,
title = {Invariant differential operators are linear combinations of symmetric positive ones.},
journal = {Mathematische Annalen},
volume = {295},
year = {1993},
pages = {535-538},
zbl = {0810.22006},
url = {http://dml.mathdoc.fr/item/GDZPPN002338769}
}
Deitmar, Anton. Invariant differential operators are linear combinations of symmetric positive ones.. Mathematische Annalen, Tome 295 (1993) pp. 535-538. http://gdmltest.u-ga.fr/item/GDZPPN002338769/