@article{MZ_1968__103_170913,
     author = {Manfred M\"uller},
     title = {Punktweise und gleichm\"a{\ss}ige {Approximation} durch {Gammaoperatoren.}},
     journal = {Mathematische Zeitschrift},
     pages = {227--238},
     publisher = {mathdoc},
     volume = {103},
     year = {1968},
     zbl = {0171.02302},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__103_170913/}
}