@article{NUMA_1961__3_131480,
     author = {P.C. SIKKEMA},
     title = {Der {Wert} einiger {Konstanten} in der {Theorie} der {Approximation} mit {Bernstein-Polynomen.}},
     journal = {Numerische Mathematik},
     pages = {107--116},
     publisher = {mathdoc},
     volume = {3},
     year = {1961},
     zbl = {0099.04701},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1961__3_131480/}
}