@article{NUMA_1968__12_131892,
     author = {H. SUNOUCHI},
     title = {Perturbation {Theory} of {Difference} {Schemes.}},
     journal = {Numerische Mathematik},
     pages = {454--458},
     publisher = {mathdoc},
     volume = {12},
     year = {1968},
     zbl = {0179.22303},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1968__12_131892/}
}