@article{GDZPPN002334852,
title = {Covariant differential operators.},
journal = {Mathematische Annalen},
volume = {287},
year = {1990},
pages = {731-739},
zbl = {0723.22017},
url = {http://dml.mathdoc.fr/item/GDZPPN002334852}
}
Enright, Thomas J.; Davidson, Mark G. Covariant differential operators.. Mathematische Annalen, Tome 287 (1990) pp. 731-739. http://gdmltest.u-ga.fr/item/GDZPPN002334852/