%%%% Nf=2+1+1
%%%% FLAG collaboration tag: ETM 15E
@article{ETM:2015bzg,
    author = "Helmes, C. and Jost, C. and Knippschild, B. and Liu, C. and Liu, J. and Liu, L. and Urbach, C. and Ueding, M. and Wang, Z. and Werner, M.",
    collaboration = "ETM",
    title = "{Hadron-hadron interactions from N$_{f}$ = 2 + 1 + 1 lattice QCD: isospin-2 \ensuremath{\pi}\ensuremath{\pi} scattering length}",
    eprint = "1506.00408",
    archivePrefix = "arXiv",
    primaryClass = "hep-lat",
    doi = "10.1007/JHEP09(2015)109",
    journal = "JHEP",
    volume = "09",
    pages = "109",
    year = "2015"
}

%%%% Nf=2
%%%% FLAG collaboration tag: ETM 09G
@article{Feng:2009ij,
    author = "Feng, Xu and Jansen, Karl and Renner, Dru B.",
    title = "{The pi+ pi+ scattering length from maximally twisted mass lattice QCD}",
    eprint = "0909.3255",
    archivePrefix = "arXiv",
    primaryClass = "hep-lat",
    reportNumber = "DESY-09-141, SFB-CPP-09-82, MS-TP-09-17",
    doi = "10.1016/j.physletb.2010.01.018",
    journal = "Phys. Lett. B",
    volume = "684",
    pages = "268--274",
    year = "2010"
}