@article{Levkova:2009wK,
  author = "Levkova, Ludmila",
  title = "{Contributions of the disconnected diagrams in the hyperfine splitting in charmonium in the quenched case }",
  doi = "10.22323/1.066.0133",
  journal = "PoS",
  year = 2009,
  volume = "LATTICE 2008",
  pages = "133"
}