%0 Journal Article %A Carlo Alberto Mantica %A Luca Guido Molinari %T A second-order identity for the Riemann tensor and applications %J Colloquium Mathematicum %D 2011 %P 69-82 %V 122 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm122-1-7/ %R 10.4064/cm122-1-7 %G en %F 10_4064_cm122_1_7