@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/