MathSciNet bibliographic data

MR648686 (83k:53036) 53B30 (53C50 58F17) Beem, J.; Chicone, C.; Ehrlich, P. The geodesic flow and sectional curvature of pseudo-Riemannian manifolds. Geom. Dedicata 12 (1982), no. 2, 111--118.

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