@article{NUMA_1960__2_131458,
     author = {H.E. SALZER},
     title = {Optimal {Points} for {Numerical} {Differentiation.}},
     journal = {Numerische Mathematik},
     pages = {214--227},
     publisher = {mathdoc},
     volume = {2},
     year = {1960},
     zbl = {0099.33703},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1960__2_131458/}
}