Osserman Conjecture in dimension n ≠ 8, 16

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Four-dimensional Osserman metrics with nondiagonalizable Jacobi operators (2005, background): “4-manifolds, and [5], [17], [18], [22], [ 23 ] for the higher dimensional Riemannian and pseudo-Riemannian cases).”
g-Natural Contact Metrics on Unit Tangent Sphere Bundles (2007, background): “In particular, if ðM;gÞ is a Riemannian manifold such that Ru admits at most two distinct eigenvalues (besides 0), then it is locally isometric to a two-point homogeneous space [ 20 ].”
Osserman manifolds of dimension 8 (2003, methodology): “We follow the plan of proof of Proposition 1 of [ 7 ].”