@article{Chen:20220H,
  author = "Chen, Long",
  title = "{Renormalization of the flavor-singlet axial-vector current and its anomaly at $N^3LO$ in QCD}",
  doi = "10.22323/1.398.0413",
  journal = "PoS",
  year = 2022,
  volume = "EPS-HEP2021",
  pages = "413"
}