@inproceedings{Ottnad:2014vc,
  author = "Ottnad, Konstantin  and  Urbach, Carsten  and  Michael, Chris",
  title = "{$\eta$ and $\eta'$ masses and decay constants from lattice QCD with $N_f=2+1+1$ quark flavours}",
  doi = "10.22323/1.187.0253",
  booktitle = "Proceedings of 31st International Symposium on Lattice Field Theory LATTICE 2013 {\textemdash} PoS(LATTICE 2013)",
  year = 2014,
  volume = "187",
  pages = "253"
}