@article{JOLT_1993_3_2_a1,
     author = {V. V. Kaiser},
     title = { Ricci-Kruemmungen linksinvarianter {Metriken} auf 4-dimensionalen nicht unimodularen {Lie'schen} {Gruppen} mit kommutativen {Faktoren}},
     journal = {Journal of Lie Theory},
     pages = {137--148},
     year = {1993},
     volume = {3},
     number = {2},
     zbl = {0788.53044},
     url = {http://geodesic.mathdoc.fr/item/JOLT_1993_3_2_a1/}
}