@article{Zhao2023,
  author    = {Lei Zhao},
  title     = {Shooting for collinear periodic orbits in the Helium model},
  journal   = {Zeitschrift f{\"u}r angewandte Mathematik und Physik},
  volume    = {74},
  number    = {6},
  pages     = {227},
  doi       = {10.1007/s00033-023-02120-8},
  year      = {2023},
}