1.
Musso M, Pejsachowicz J, Portaluri A. A Morse index theorem for perturbed geodesics on semi-Riemannian manifolds. TMNA [Internet]. 2005 Mar. 1 [cited 2024 Apr. 27];25(1):69-9. Available from: https://apcz.umk.pl/TMNA/article/view/TMNA.2005.004