@article{GDZPPN002339129, title = {On porcupine varieties in Lie algebras.}, journal = {Mathematische Annalen}, volume = {300}, year = {1994}, pages = {403-426}, zbl = {0791.17007}, url = {http://dml.mathdoc.fr/item/GDZPPN002339129} }
Hofmann, Karl Heinrich; Ruppert, W.A.F. On porcupine varieties in Lie algebras.. Mathematische Annalen, Tome 300 (1994) pp. 403-426. http://gdmltest.u-ga.fr/item/GDZPPN002339129/