@misc{onishchenko2002loop,
  title={Two-Loop Electroweak Corrections to $Δr$},
  author={A. Onishchenko and O. Veretin},
  year={2002},
  eprint={hep-ph/0211280},
  archivePrefix={arXiv},
  primaryClass={hep-ph},
  doi={10.1016/S0920-5632(03)80176-7},
  url={https://arxiv.org/abs/hep-ph/0211280}
}