@article{MZ_1964__85_170315,
     author = {Raymond E. Pippert},
     title = {On absolutely convergent trigonometric series.},
     journal = {Mathematische Zeitschrift},
     pages = {401--406},
     publisher = {mathdoc},
     volume = {85},
     year = {1964},
     zbl = {0131.06705},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__85_170315/}
}