%0 Journal Article %A D. Degrijse %T On a Filtration of the Second Cohomology of Nilpotent Lie Algebras %J Journal of Lie theory %D 2013 %P 551-573 %V 23 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/JLT_2013_23_2_JLT_2013_23_2_a9/ %F JLT_2013_23_2_JLT_2013_23_2_a9