@article{NUMA_1993__66_3_133773,
     author = {Robert McLachlan},
     title = {Symplectic integration of {Hamiltonian} wave equations.},
     journal = {Numerische Mathematik},
     pages = {465--492},
     publisher = {mathdoc},
     volume = {66},
     number = {3},
     year = {1993},
     zbl = {0831.65099},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1993__66_3_133773/}
}