Non-autonomous second order Hamiltonian systems

Morse‐type index theory for flows and periodic solutions for Hamiltonian Equations

Charles C. Conley, Eduard Zehnder · Communications on Pure and Applied Mathematics · 1984 · 466 citations

Natural Sciences, Mathematics, Differential Equations +13

Remarks on finding critical points

Haïm Brézis, Louis Nirenberg · Communications on Pure and Applied Mathematics · 1991 · 406 citations

Natural Sciences, Geophysics, Critical Theory +8

Applications of Local Linking to Critical Point Theory

S.J. Li, M. Willem · Journal of Mathematical Analysis and Applications · 1995 · 228 citations

Natural Sciences, Mathematics, Physics +14

On subharmonic solutions of hamiltonian systems

Paul H. Rabinowitz · Communications on Pure and Applied Mathematics · 1980 · 209 citations

Natural Sciences, Mathematics, Physics +12

Periodic solutions for nonautonomous second order systems with sublinear nonlinearity

Chun‐Lei Tang · Proceedings of the American Mathematical Society · 1998 · 176 citations · Full text

Natural Sciences, Mathematics, Differential Equations +13