@article{Liu:2012RM,
  author = "Liu, Chuan  and  Chen, Ying",
  title = "{Radiative transitions in charmonium from $N_f=2$ twisted mass lattice QCD}",
  doi = "10.22323/1.139.0163",
  journal = "PoS",
  year = 2012,
  volume = "Lattice 2011",
  pages = "163"
}