@article{
  author = {Emami-Razavi, Mohsen, Asgary, Somayeh},
  title = {Study of virtual annihilation and retardation effects in relativistic two-, four-, and six-body wave equations in scalar QFT},
  journal = {Journal of Theoretical and Applied Physics},
  year = {2017},
  volume = {0},
  number = {4},
  pages = {249-262},
  doi = {10.1007/s40094-017-0264-x}
}