@article{Colquhoun:2023mJ,
  author = "Colquhoun, Brian  and  Cooper, Laurence  and  Davies, Christine  and  Lepage, G. Peter",
  title = "{Precise determination of decay rates for $\eta_c \to \gamma \gamma$ and $J/\psi \to \gamma\eta_c$}",
  doi = "10.22323/1.430.0054",
  journal = "PoS",
  year = 2023,
  volume = "LATTICE2022",
  pages = "054"
}