@conference{Bon-Haz-Mer-Red-2009,
    author={Anne-Sophie Bonnet-BenDhia and Christophe Hazard and 
           Jean-François Mercier and Emmanuel Redon },
    title={Dirichlet-to-Neumann operators for an acoustic waveguide with 
           a uniform flow and an impedance boundary condition },
    publisher={9th International Conference on Mathematical and Numerical 
           Aspects of Wave Propagation (WAVES'09), Pau },
    year={2009 },
    month={6},
}