@article{MZ_1969__109_171127,
     author = {Joachim Nitsche},
     title = {S\"atze vom {Jackson-Bernstein-Typ} f\"ur die {Approximation} mit {Spline-Funktionen.}},
     journal = {Mathematische Zeitschrift},
     pages = {97--106},
     publisher = {mathdoc},
     volume = {109},
     year = {1969},
     zbl = {0174.35502},
     url = {http://geodesic.mathdoc.fr/item/MZ_1969__109_171127/}
}