@article{Bon-Car-Che-Cia-2016,
    author={Anne-Sophie Bonnet-BenDhia and Camille Carvalho and Lucas 
           Chesnel and Patrick Ciarlet },
    title={On the use of Perfectly Matched Layers at corners for 
           scattering problems with sign-changing coefficients },
    doi={10.1016/j.jcp.2016.06.037 },
    journal={J. Comput. Phys. },
    year={2016 },
    volume={322 },
    pages={224--247},
}