@inproceedings{Bec-Col-Jol-1995,
    author={Éliane Bécache and Francis Collino and Patrick Joly },
    title={Higher order numerical schemes for paraxial approximations of 
           the wave equation },
    organization={2nd International Conference on Theoretical and Computational 
           Acoustics, },
    year={1995 },
    month={8},
}