@article{MZ_1958__69_169752,
     author = {Yung-Ming Chen},
     title = {On a maximal theorem of {Hardy} and {Littlewood} and theorems concerning {Fourier} constants.},
     journal = {Mathematische Zeitschrift},
     pages = {418--422},
     publisher = {mathdoc},
     volume = {69},
     year = {1958},
     zbl = {0084.06301},
     url = {http://geodesic.mathdoc.fr/item/MZ_1958__69_169752/}
}