@conference{Bon-Cia-Zwo-2005-1,
    author={Anne-Sophie Bonnet-BenDhia and Patrick Ciarlet and Carlo Maria 
           Zwölf },
    title={A variational approach for wave transmission between media 
           with opposite sign dielectric constant },
    publisher={7th International Conference on Mathematical and Numerical 
           Aspects of Waves (WAVES'05), Providence },
    year={2005 },
    month={6},
}