Aequationes Mathematicae · 1990 · 17 citations · 6 references
Natural SciencesMathematicsGeometryClassical GeometryDifferential GeometryEuclidean GeometryMetric GeometryRiemannian GeometrySpacetime GeometryCircle GeometryPseudo-riemannian GeometryRiemannian Metric
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On circles and spheres in Riemannian geometry
Katsumi Nomizu, Kentarô Yano · Mathematische Annalen · 1974 · 153 citations
Manifolds with planar geodesics
John A. Little · Journal of Differential Geometry · 1976 · 47 citations · Full text