@article{SEMR_2009_6_a16,
     author = {A. G. Kremlyov},
     title = {Ricci curvatures of left invariant {Riemannian} metrics on five dimensional nilpotent {Lie} groups},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {326--339},
     publisher = {mathdoc},
     volume = {6},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2009_6_a16/}
}