@article{GDZPPN002023911,
title = {Divergence-Free Tensorial Concomitants.},
journal = {Aequationes mathematicae},
volume = {5},
year = {1970},
pages = {127-138},
zbl = {0193.50602},
url = {http://dml.mathdoc.fr/item/GDZPPN002023911}
}
Lovelock, David. Divergence-Free Tensorial Concomitants.. Aequationes mathematicae, Tome 5 (1970) pp. 127-138. http://gdmltest.u-ga.fr/item/GDZPPN002023911/