@article{01423424, title = {A secondary Chern-Euler class.}, journal = {Annals of Mathematics. Second Series}, volume = {150}, year = {1999}, pages = {1151-1158}, doi = {10.2307/121065}, zbl = {0980.57012}, language = {en}, url = {http://dml.mathdoc.fr/item/01423424} }
Sha, Ji-Ping. A secondary Chern-Euler class.. Annals of Mathematics. Second Series, Tome 150 (1999) pp. 1151-1158. doi : 10.2307/121065. http://gdmltest.u-ga.fr/item/01423424/