%0 Journal Article %A O. P. Gladunova %A V. V. Slavskii %T Harmonicity of the Weyl tensor of left-invariant Riemannian metrics on four-dimensional unimodular Lie groups %J Matematičeskie trudy %D 2011 %P 50-69 %V 14 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MT_2011_14_1_a1/ %G ru %F MT_2011_14_1_a1