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@article{MAN_1993__297_3_165144, author = {Anton Deitmar}, title = {Invariant differential operators are linear combinations of symmetric positive ones.}, journal = {Mathematische Annalen}, pages = {535--538}, publisher = {mathdoc}, volume = {297}, number = {3}, year = {1993}, zbl = {0810.22006}, url = {http://geodesic.mathdoc.fr/item/MAN_1993__297_3_165144/} }
Anton Deitmar. Invariant differential operators are linear combinations of symmetric positive ones.. Mathematische Annalen, Tome 297 (1993) no. 3, pp. 535-538. http://geodesic.mathdoc.fr/item/MAN_1993__297_3_165144/