@article{Ottnad:2012/r,
  author = "Ottnad, Konstantin  and  Urbach, C.  and  Michael, Chris  and  Reker, Siebren",
  title = "{Masses of eta, eta' Mesons from 2+1+1 Twisted Mass Lattice QCD}",
  doi = "10.22323/1.139.0336",
  journal = "PoS",
  year = 2012,
  volume = "Lattice 2011",
  pages = "336"
}