@article{NUMA_1971__18_132113,
     author = {T. Tsuda},
     title = {Numerical {Differentation} of {Functions} of {Very} {Many} {Variables.}},
     journal = {Numerische Mathematik},
     pages = {327--335},
     publisher = {mathdoc},
     volume = {18},
     year = {1971},
     zbl = {0215.27301},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1971__18_132113/}
}