%0 Journal Article %A Giovanni Calvaruso %A Amirhesam Zaeim %T Neutral Metrics on Four-Dimensional Lie Groups %J Journal of Lie Theory %D 2015 %P 1023-1044 %V 25 %N 4 %U http://geodesic.mathdoc.fr/item/JOLT_2015_25_4_a4/ %F JOLT_2015_25_4_a4