@article{GDZPPN00233321X, title = {Classes caract\'eristiques isotropes.}, journal = {Mathematische Annalen}, volume = {283}, year = {1989}, pages = {343-352}, zbl = {0662.55009}, url = {http://dml.mathdoc.fr/item/GDZPPN00233321X} }
Lalonde, Francois. Classes caractéristiques isotropes.. Mathematische Annalen, Tome 283 (1989) pp. 343-352. http://gdmltest.u-ga.fr/item/GDZPPN00233321X/