@article{JLT_2003_13_1_JLT_2003_13_1_a6,
     author = {G. Benkart and O. Smirnov },
     title = {Lie {Algebras} {Graded} by the {Root} {System} {BC\protect\textsubscript{1}}},
     journal = {Journal of Lie theory},
     pages = {91--132},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {2003},
     url = {http://geodesic.mathdoc.fr/item/JLT_2003_13_1_JLT_2003_13_1_a6/}
}