@article{MOMA_1963__67_177225,
     author = {F. Schurer},
     title = {Some {Remarks} on the {Approximation} of {Functions} by {Some} {Positive} {Linear} {Operators.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {353--358},
     publisher = {mathdoc},
     volume = {67},
     year = {1963},
     zbl = {0163.30701},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1963__67_177225/}
}