@article{05827280,
title = {The cohomology rings of moduli stacks of principal bundles over curves.},
journal = {Documenta Mathematica},
volume = {15},
year = {2010},
pages = {423-488},
zbl = {1206.14029},
language = {en},
url = {http://dml.mathdoc.fr/item/05827280}
}
Heinloth, Jochen; Schmitt, Alexander H.W. The cohomology rings of moduli stacks of principal bundles over curves.. Documenta Mathematica, Tome 15 (2010) pp. 423-488. http://gdmltest.u-ga.fr/item/05827280/