@article{JLT_2008_18_2_JLT_2008_18_2_a9,
     author = {M. Stroppel },
     title = {The {Klein} {Quadric} and the {Classification} of {Nilpotent} {Lie} {Algebras} of {Class} {Two}},
     journal = {Journal of Lie theory},
     pages = {391--411},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/JLT_2008_18_2_JLT_2008_18_2_a9/}
}