@article{MT_2011_14_1_a1,
     author = {O. P. Gladunova and V. V. Slavskii},
     title = {Harmonicity of the {Weyl} tensor of left-invariant {Riemannian} metrics on four-dimensional unimodular {Lie} groups},
     journal = {Matemati\v{c}eskie trudy},
     pages = {50--69},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2011_14_1_a1/}
}