@article{Marquard:2013aA,
  author = "Marquard, Peter",
  title = "{NRQCD matching coefficient at next-to-next-to-next-to-leading order}",
  doi = "10.22323/1.174.0223",
  journal = "PoS",
  year = 2013,
  volume = "ICHEP2012",
  pages = "223"
}