1. Index Theory for Symplectic Paths with Applications;Long,2002
2. On bifurcation of eigenvalues along convex symplectic paths;Chang;Ann. Inst. Henri Poincaré, Anal. Non Linéaire,2019
3. Convexity Methods in Hamiltonian Mechanics;Ekeland,1990
4. Linear Differential Equations with Periodic Coefficients. 1, 2;Yakubovich,1975
5. Analytic properties of the multipliers of periodic canonical differential systems of positive type;Kreĭn;Izv. Akad. Nauk SSSR, Ser. Mat.,1962