On stability and Maslov indices of geodesics in (semi-)Riemannian manifolds:
Paolo Piccione, Alessandro Portaluri, Daniel V. Tausk: Spectral Flow, Maslov Index and Bifurcation of Semi-Riemannian Geodesics, Annals of Global Analysis and Geometry 25 (2004) 121–149 [doi:10.1023/B:AGAG.0000018558.65790.db]
Alessandro Portaluri, Li Wu, Ran Yang: Linear instability for periodic orbits of non-autonomous Lagrangian systems, Nonlinearity 34 1 (2021) 237 [arXiv:1907.05864]
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