@article{DeFreitas:2013I6,
  author = "De Freitas, Abilio  and  Bluemlein, Johannes  and  van Neerven, Wilhelmus",
  title = "{Two-Loop QED Operator Matrix Elements with a Massive External Fermion Line}",
  doi = "10.22323/1.145.0033",
  journal = "PoS",
  year = 2013,
  volume = "RADCOR2011",
  pages = "033"
}