%0 Journal Article %A W. Roter %T Some indefinite metrics and covariant derivatives of their curvature tensors %J Colloquium Mathematicum %D 1991 %P 283-292 %V 62 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-62-2-283-292/ %R 10.4064/cm-62-2-283-292 %G en %F 10_4064_cm_62_2_283_292