@article{NUMA_1989__54_3_133339,
     author = {J.C. Guillot and P. Joly},
     title = {Approximation by {Finite} {Differences} of the {Propagation} of {Acoustic} {Waves} in {Stratified} {Media.}},
     journal = {Numerische Mathematik},
     pages = {655--702},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1989},
     zbl = {0676.76075},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1989__54_3_133339/}
}