@article{NUMA_1963__5_131583,
     author = {H.C. KRANZER},
     title = {An {Error} {Formula} for {Numerical} {Differentiation.}},
     journal = {Numerische Mathematik},
     pages = {439--442},
     publisher = {mathdoc},
     volume = {5},
     year = {1963},
     zbl = {0123.12105},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1963__5_131583/}
}