@conference{Cas-Haz-Jol-2013-3,
    author={Maxence Cassier and Christophe Hazard and Patrick Joly },
    title={Space-time focusing for acoustic waves },
    publisher={Novel Direction in Inverse Scattering, honoring D. Colton, 
           Newark, Delaware, USA, poster (soon) },
    year={2013 },
    month={7},
}