@article{Bel-Bon-Cak-2013,
    author={Cédric Bellis and Marc Bonnet and Fioralba Cakoni },
    title={Acoustic inverse scattering using topological derivative of 
           far-field measurements-based $L^2$ cost functionals },
    doi={10.1088/0266-5611/29/7/075012 },
    journal={Inverse Problems },
    year={2013 },
    volume={29 },
    pages={075012},
}