@article{MZ_1976__146_172294,
     author = {Manfred v. Golitschek},
     title = {Lineare {Approximation} durch komplexe {Exponentialsummen.}},
     journal = {Mathematische Zeitschrift},
     pages = {17--32},
     publisher = {mathdoc},
     volume = {146},
     year = {1976},
     zbl = {0298.41011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__146_172294/}
}