@article{NUMA_1987__51_133198,
     author = {P.A. Raviart and S. Mas-Gallic},
     title = {A {Particle} {Method} for {First-order} {Symmetric} {Systems.}},
     journal = {Numerische Mathematik},
     pages = {323--352},
     publisher = {mathdoc},
     volume = {51},
     year = {1987},
     zbl = {0625.65084},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1987__51_133198/}
}