@inproceedings{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",
  booktitle = "Proceedings of The XXVI International Symposium on Lattice Field Theory  {\textemdash} PoS(LATTICE 2008)",
  year = 2009,
  volume = "066",
  pages = "133"
}