@article{Fli-Jol-2016,
    author={Sonia Fliss and Patrick Joly },
    title={Solutions of the time-harmonic wave equation in periodic 
           waveguides : asymptotic behaviour and radiation condition },
    doi={10.1007/s00205-015-0897-3 },
    journal={Archive for rational mechanics and analysis },
    year={2016 },
    month={1},
    volume={219(1) },
    pages={349--386},
}