%0 Journal Article %A Martin Markl %T Lie Elements in Pre-Lie Algebras, Trees and Cohomology Operations %J Journal of Lie Theory %D 2007 %P 241-261 %V 17 %N 2 %U http://geodesic.mathdoc.fr/item/JOLT_2007_17_2_a1/ %F JOLT_2007_17_2_a1