@article{JOLT_2014_24_2_a1,
     author = {Hechmi Ben Messaoud and Guy Rousseau},
     title = {Kac-Moody {Lie} {Algebras} {Graded} by {Kac-Moody} {Root} {Systems}},
     journal = {Journal of Lie Theory},
     pages = {321--350},
     year = {2014},
     volume = {24},
     number = {2},
     zbl = {1357.17023},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2014_24_2_a1/}
}