@article{701533,
title = {Natural 2-forms on the tangent bundle of a Riemannian manifold},
booktitle = {Proceedings of the Winter School "Geometry and Topology"},
series = {GDML\_Books},
publisher = {Circolo Matematico di Palermo},
address = {Palermo},
year = {1993},
pages = {[165]-174},
mrnumber = {MR1283629},
zbl = {0818.53020},
url = {http://dml.mathdoc.fr/item/701533}
}
Janyška, Josef. Natural 2-forms on the tangent bundle of a Riemannian manifold, dans Proceedings of the Winter School "Geometry and Topology", GDML_Books, (1993), pp. [165]-174. http://gdmltest.u-ga.fr/item/701533/