Bifurcation for second-order Hamiltonian systems with periodic boundary conditions. Faraci, Francesca, Iannizzotto, Antonio (2008) Abstract and Applied Analysis
Bounded solutions to a system of second order ODEs and the Whitney pendulum Oleg Zubelevich (2015) Applicationes Mathematicae We give an existence theorem for bounded solutions to a system of second order ODEs. Dynamical applications are considered.