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S.-S. Chern, On curvature and characteristic classes of a Riemannian manifold, Abh. Math. Sem. Univ. Hamburg 20 (1955), 117-126. MR 0075647 (17:783e)

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H. Guggenheimer, Vierdimensionale Einsteinräume, Rend. Mat. e Appl. 11 (1952), 362-373. MR 0060883 (15:742g)

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H. Samelson, On curvature and characteristic of homogeneous spaces, Michigan Math. J. 5 (1958), 13-18. MR 0103509 (21:2277)

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T. Frankel, Manifolds with positive curvature, Pacific J. Math. 11 (1961), 165-174. MR 0123272 (23:A600)