@article{Levkova:2008kC,
  author = "Levkova, Ludmila",
  title = "{Effects of the disconnected flavor singlet corrections on the hyperfine splitting in charmonium}",
  doi = "10.22323/1.042.0116",
  journal = "PoS",
  year = 2008,
  volume = "LATTICE 2007",
  pages = "116"
}