@article{JFAA_2001__7_4_59700,
     author = {Ferenc M\'oricz},
     title = {Extension of a {Theorem} of {Fej\'er} to {Double} {Fourier-Stieltjes} {Series.}},
     journal = {The journal of Fourier analysis and applications},
     pages = {601--614},
     year = {2001},
     volume = {7},
     number = {4},
     zbl = {1001.42008},
     url = {http://geodesic.mathdoc.fr/item/JFAA_2001__7_4_59700/}
}