Bifurcation Theory
Hu, Xijun; Portaluri, Alessandro Bifurcation of heteroclinic orbits via an index theory. Math. Z. 292 (2019), no. 1-2, 705–723.
Portaluri, Alessandro; Waterstraat, Nils A K-theoretical invariant and bifurcation for homoclinics of Hamiltonian systems. J. Fixed Point Theory Appl. 19 (2017), no. 1, 833–851.
Portaluri, Alessandro; Waterstraat, Nils On bifurcation for semilinear elliptic Dirichlet problems on geodesic balls. J. Math. Anal. Appl. 415 (2014), no. 1, 240–246.
Portaluri, Alessandro; Waterstraat, Nils Bifurcation results for critical points of families of functionals. Differential Integral Equations 27 (2014), no. 3-4, 369–386.
Portaluri, Alessandro; Waterstraat, Nils On bifurcation for semilinear elliptic Dirichlet problems and the Morse-Smale index theorem. J. Math. Anal. Appl. 408 (2013), no. 2, 572–575.
Portaluri, Alessandro A K-theoretical invariant and bifurcation for a parameterized family of functionals. J. Math. Anal. Appl. 377 (2011), no. 2, 762–770.