%0 Journal Article %A Casas, J. M. %A Ladra, M. %T Stem extensions and stem covers of Leibniz algebras. %J Georgian Mathematical Journal %D 2002 %P 659-669 %V 9 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/GMJ_2002__9_4_51054/ %G en %F GMJ_2002__9_4_51054