@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/