Homoclinic orbits for a class of nonperiodic Hamiltonian systems with   some twisted conditions
  In this paper, by the Masolv index theory, we will study the existence and multiplicity of homoclinic orbits for a class of asymptotically linear nonperiodic Hamiltonian systems with some twisted conditions on the Hamiltonian functions 
Qi Wang and Qingye Zhang
math.DS math.CA