We prove the existence of nontrivial critical points of functionals with a local Linking at 0. Applications to elliptic boundary value problems and to Hamiltonian systems are given. (C) 1995 Academic Press, Inc.
Li, SJ., & Willem, M. (1995). Applications of Local Linking To Critical-point Theory. Journal of Mathematical Analysis and Applications, 189(1), 6-32. https://doi.org/10.1006/jmaa.1995.1002 (Original work published 1995)