%0 Journal Article %A Kowalski, Oldřich %A Prüfer, Friedbert %T Curvature tensors in dimension four which do not belong to any curvature homogeneous space %J Archivum mathematicum %D 1994 %P 45-57 %V 30 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1994__30_1_a5/ %G en %F ARM_1994__30_1_a5