MathSciNet bibliographic data MR683165 53C35 (53C21) Szabó, Z. I. Structure theorems on Riemannian spaces satisfying $R(X,\,Y)\cdot R=0$$R(X,\,Y)\cdot R=0$. I. The local version. J. Differential Geom. 17 (1982), no. 4, 531–582 (1983). Article

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