@article{Chetyrkin:2010Y+,
  author = "Chetyrkin, Konstantin",
  title = "{R(s) Bjorken sum rule and the Crewther Relation in order alpha_s^4}",
  doi = "10.22323/1.092.0073",
  journal = "PoS",
  year = 2010,
  volume = "RADCOR2009",
  pages = "073"
}