Juan Campos, Massimo Tarallo, “Large minimal period orbits of periodic autonomous systems”, Nonlinearity, 17:1 (2004), 357
Mark Levi, “On a problem by Arnold on periodic motions in magnetic fields”, Comm Pure Appl Math, 56:8 (2003), 1165
P.H. Rabinowitz, Handbook of Dynamical Systems, 1, 2002, 1091
Chao-Nien Chen, Shyuh-yaur Tzeng, “Periodic Solutions and Their Connecting Orbits of Hamiltonian Systems”, Journal of Differential Equations, 177:1 (2001), 121
Chao-Nien Chen, Shyuh-yaur Tzeng, “Existence and Multiplicity Results for Heteroclinic Orbits of Second Order Hamiltonian Systems”, Journal of Differential Equations, 158:2 (1999), 211
Miguel Sánchez, “Geodesics in static spacetimes and t-periodic trajectories”, Nonlinear Analysis: Theory, Methods & Applications, 35:6 (1999), 677
В. В. Козлов, В. В. Тен, “Топология областей возможности движения интегрируемых систем”, Матем. сб., 187:5 (1996), 59–64 ; V. V. Kozlov, V. V. Ten, “Topology of domains of possible motions of integrable systems”, Sb. Math., 187:5 (1996), 679–684
B. Buffoni, “Periodic and homoclinic orbits for Lorentz-Lagranian systems via variational methods”, Nonlinear Analysis: Theory, Methods & Applications, 26:3 (1996), 443
Paul H. Rabinowitz, Topological Nonlinear Analysis, 1995, 464
Kazunaga Tanaka, “A note on the existence of multiple homoclinic orbits for a perturbed radial potential”, Nonlinear differ equ appl, 1:2 (1994), 149