@article{ScherdinSchaeferGreineretal.2006,
  author    = {Alexander Scherdin and Andreas Sch{\"a}fer and Walter Greiner and Gerhard Soff},
  title     = {Delbr{\"u}ck scattering in a strong external field},
  journal   = {Physical review D},
  volume    = {45},
  number    = {8},
  pages     = {2982 -- 2987},
  url       = {http://link.aps.org/abstract/PRD/v45/p2982},
  year      = {2006},
}