@article{Gibble:2006aa,
    Author = {Kurt Gibble},
    Eid = {073002},
    Journal = {Phys. Rev. Lett.},
    Number = {7},
    Pages = {073002},
    Publisher = {APS},
    Title = {Difference between a Photon's Momentum and an Atom's Recoil},
    Volume = {97},
    Year = {2006}}
    
    
@article{Andre:2005aa,
    Author = {A. Andr\'e and M. Bajcsy and A. S. Zibrov and M. D. Lukin},
    Journal = {Phys. Rev. Lett.},
    Keywords = {nonlinear optics; optical Kerr effect; quantum optics},
    Number = {6},
    Pages = {063902},
    Volume = {94},
    Year = {2005}}