@article{GDZPPN002484889, title = {Lorentzian Cones in Real Lie Algebras.}, journal = {Monatshefte f\"ur Mathematik}, volume = {99}, year = {1985}, pages = {183-210}, zbl = {0571.22015}, url = {http://dml.mathdoc.fr/item/GDZPPN002484889} }
Hofmann, Karl H.; Hilgert, Joachim. Lorentzian Cones in Real Lie Algebras.. Monatshefte für Mathematik, Tome 99 (1985) pp. 183-210. http://gdmltest.u-ga.fr/item/GDZPPN002484889/