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Invariants of curvature operators of four-dimensional Riemannian manifolds. (English) Zbl 0278.53034
Proc. 13th biennial Sem. Canad. math. Congr. differ. Topol. differ. Geom. Appl., Dalhousie Univ. Halifax 1971, 2, 42-65 (1972).

53C20 Global Riemannian geometry, including pinching
53C65 Integral geometry
53C55 Global differential geometry of Hermitian and Kählerian manifolds