@conference{Bec-Bon-Leg-2004-1,
    author={Éliane Bécache and Anne-Sophie Bonnet-BenDhia and Guillaume 
           Legendre },
    title={Perfectly Matched Layers for the solution of time harmonic 
           diffraction problems in waveguides. },
    publisher={PIERS (Progress In Electromagnetic Research Symposium), Pise },
    year={2004 },
    month={3},
}