@article{GDZPPN002096471, title = {Invariant Theory for Generalized Root Systems.}, journal = {Inventiones mathematicae}, volume = {56}, year = {1980}, pages = {1-32}, zbl = {0436.17005}, url = {http://dml.mathdoc.fr/item/GDZPPN002096471} }
Looijenga, Eduard. Invariant Theory for Generalized Root Systems.. Inventiones mathematicae, Tome 56 (1980) pp. 1-32. http://gdmltest.u-ga.fr/item/GDZPPN002096471/