@article{articlee6ab2040, title = {A generalized index theorem for Morse-Sturm systems and applications to semi-Riemannian geometry}, author = {Giannoni, Fábio and Masiello, Antônio and Piccione, Paolo and Tausk, Daniel Victor}, year = {2001}, doi = {10.4310/ajm.2001.v5.n3.a3}, journal = {Asian Journal of Mathematics} }