@inproceedings{Fli-Jol-Li-2007,
    author={Sonia Fliss and Patrick Joly and Jing-Rebecca Li },
    title={Computation of harmonic wave propagation in infinite periodic 
           media },
    organization={Report No.5/2007 of Mathematisches Forschungsinstitut 
           Oberwolfach "Computational Electromagnetism and Acoustics, 
           Oberwolfach. },
    year={2007 },
}