Generalized Cohomological Index Theories for Lie Group Actions with an Application to Bifurcation Questions for Hamiltonian Systems. E.R. Fadell, P.H. Rabinowitz (1978) Inventiones mathematicae
Geodesics on S2 and periodic points of annulus homeomorphisms. John Franks (1992) Inventiones mathematicae
Global behavior of four competitive rational systems of difference equations in the plane. Garić-Demirović, M., Kulenović, M.R.S., Nurkanović, M. (2009) Discrete Dynamics in Nature and Society
Global stability of saddle-node bifurcation of a periodic orbit for vector fields S. Sergio Plaza (1994) Annales de la Faculté des sciences de Toulouse : Mathématiques
Group analysis methods for construction and investigation of the bifurcation equation B. V. Loginov (1992) Applications of Mathematics