@article{MZ_1979__169_172895,
     author = {Franz Peherstorfer},
     title = {Trigonometric {Polynomial} {Approximation} in the {L1-Form.}},
     journal = {Mathematische Zeitschrift},
     pages = {261--270},
     publisher = {mathdoc},
     volume = {169},
     year = {1979},
     zbl = {0415.41005},
     url = {http://geodesic.mathdoc.fr/item/MZ_1979__169_172895/}
}